https://www.prodetecting.com/blog daily 0.75 2026-04-24 https://www.prodetecting.com/blog/environmental-stained-silvers monthly 0.5 2026-04-26 https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/318156ec-0243-4d6b-9a16-378cde9a9c7b/SxS+-+1+Post+Alkali.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/95d84178-3c8d-4e09-bccd-a7114441d465/SxS+-+6+Post+Tumbler.jpg Blog - Environmentally Stained Silvers After https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/ee09878a-b64e-4a23-938c-8ccd538b7964/1883-S_Morgan_Dollar_P1.jpg Blog - Environmentally Stained Silvers This 1883-S Morgan Dollar was found in a field that likely encountered one or more grass fires over its time in the ground. The fire scale is localized to the Obverse which was facing up when extracted. These images are after an Alkali Wash treatment. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/5bb8a6f0-704f-499d-b07c-2b39b785f79e/Circulation+Cameo+Example+1.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/ec481d86-302f-4da9-a547-1d533b4614b7/1882_Seated-Liberty-Dime_01_Obverse_P4.JPG Blog - Environmentally Stained Silvers - 1882 Seated Liberty Dime 1882 Seated Liberty Dime https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/40f0fed9-e74f-4bbf-a728-ba2935c0f67d/1922_Peace_Dollar_01_O.JPG Blog - Environmentally Stained Silvers - 1922-S Peace Dollar 1922-S Peace Dollar https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/4627ce98-8319-4444-a6d4-51f21663b525/1876_Seated_Liberty_Half_Dollar_01_O.JPG Blog - Environmentally Stained Silvers - 1876 Seated Liberty Half Dollar 1876 Seated Liberty Half Dollar https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/318156ec-0243-4d6b-9a16-378cde9a9c7b/SxS+-+1+Post+Alkali.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f56500ca-e347-4a9a-af1c-de029704d57e/SxS+-+2+Post+Thiosulfate.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f56500ca-e347-4a9a-af1c-de029704d57e/SxS+-+2+Post+Thiosulfate.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/529507ca-8570-4f0e-abf2-cfa07d4f64d4/SxS+-+3+Post+Acid.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/529507ca-8570-4f0e-abf2-cfa07d4f64d4/SxS+-+3+Post+Acid.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/641f6b61-6e62-4ff7-af1d-db6700e86e61/SxS+-+4+Post+Foil.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/12cba529-f1d8-4c4a-95af-83f447061577/Snap+2026-04-23+at+22.44.06.jpg Blog - Environmentally Stained Silvers https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/641f6b61-6e62-4ff7-af1d-db6700e86e61/SxS+-+4+Post+Foil.jpg Blog - Environmentally Stained Silvers Patina is healthy. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/95d84178-3c8d-4e09-bccd-a7114441d465/SxS+-+6+Post+Tumbler.jpg Blog - Environmentally Stained Silvers Patina is not healthy. https://www.prodetecting.com/blog/vdi-by-type monthly 0.5 2026-03-14 https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/ccd3b54e-8b93-4e4f-b680-03cb50d9d420/CENT_HALF-Liberty-Cap-Half-Cent-%281793-1797%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/42b53eba-dec9-4706-a60f-07ac7ec0fb51/CENT_HALF-Draped-Bust-Half-Cent-%281800-1808%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/8378802d-0c15-4814-a2af-5dd918875ff7/CENT_HALF-Braided-Hair-Half-Cent-%281840-1857%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - 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VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/d7c3817e-95fe-43dc-90a9-5e8d80d58eea/CENT_LARGE-Classic-Head-Cent-%281808-1814%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/4980eb9f-2f3f-41c7-b893-9bb5afc84bb1/CENT_LARGE-Coronet-Head-Cent-%281816-1839%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/ab544e18-4bc4-4257-853b-f1686cb512b7/CENT_LARGE-Braided-Hair-Cent-%281839-1857%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/c1890e56-fcbe-48b9-910c-528cf2669e11/CENT_SMALL-Flying-Eagle-Cent-%281856-1858%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/98043d5e-a4f6-4992-abc5-399fede77b5e/CENT_SMALL-Indian-Cent-%281859-1909%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/25696e90-4a7b-4184-83f1-421745b3de8b/CENT_SMALL-Lincoln-Wheat-Cent-%281909-1958%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - 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VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/67813d2c-95fd-435a-bf85-3f04fab60b8a/CENT_THREE-Three-Cent-Nickel-%281865-1889%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b4db3a1f-32b5-4bd8-820b-802310fba6bf/CENT_TWENTY-Twenty-Cent-%281875-1878%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/7c5b233a-4558-44d8-88b6-0d8e040b4a89/NICKEL-Shield-Nickel-%281866-1883%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/7aad1c4a-9c23-42c1-ba8a-171fdc946fac/NICKEL-Liberty-Nickel-%281883-1913%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/90ee7014-b077-4071-b179-4a769a7ceeb4/NICKEL-Buffalo-Nickel-%281913-1938%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/9e06012e-db78-4360-b3d0-274a57283ed6/NICKEL-Jefferson-Nickel-%281938-Date%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/236b6270-39cc-4e8e-89e4-0138e41cdd54/DIME_HALF-Bust-Half-Dime-%281792%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/1997881a-cf9b-4c1f-aea4-97beede58846/DIME_HALF-Flowing-Hair-Half-Dime-%281794-1795%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/e9522e60-f45c-4249-9237-929142db1e13/DIME_HALF-Draped-Bust-Half-Dime-%281796-1805%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/d5b6fd1a-3ef2-4469-944b-8e0c4c09993e/DIME_HALF-Capped-Bust-Half-Dime-%281829-1837%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/368cbebf-56ac-420f-97e6-b13b6a3216b2/DIME_HALF-Liberty-Seated-Half-Dime-%281837-1873%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b7710318-9ee3-4bdf-8aa2-127f43562c8e/DIME_Draped-Bust-Dime-%281796-1807%29.jpg Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b269167b-364e-4814-896a-19597d9a5f82/divider-36066.png Blog - VDI: Know Your Types https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/23a7174d-e3eb-47ff-95a4-ed25f41b2afc/DIME_Capped-Bust-Dime-%281809-1837%29.jpg Blog - 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Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Superficial Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/7800e052-e643-4f3c-8aa1-ebae6f3fd0e6/Corrosion_Example_Superficial_3.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Superficial Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/80fe896c-066d-4a91-b30d-63fea73f23ff/Corrosion_Example_Superficial_1.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Superficial Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/5ad0f916-914e-4fab-af9d-fb2986d3a995/Corrosion_Example_Superficial_4.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Superficial Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/505f0e42-4563-4154-ac41-300a16757f7f/Corrosion_Example_Developing_1.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Developing Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/a8c3b89e-2deb-4b7c-9ee8-2871c0bba018/Corrosion_Example_Developing_2.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Developing Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/df27ccbd-1363-492f-89f7-8a249727ee36/Corrosion_Example_Developing_3.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Developing Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/1971d7bb-4b7b-439e-be79-8c4959d3c9e0/Corrosion_Example_Developing_4.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Developing Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/707eca24-f0b1-4ad9-bc78-a69089ccfb0a/Corrosion_Example_Terminal_2.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Terminal Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/de2548e2-8491-4ff7-a7db-41bb18c145d3/Corrosion_Example_Terminal_1.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Terminal Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/80278947-c64b-4df6-877c-a2437b6bd3c0/Terminal_Corrosion_Cull_1.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Terminal Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f423753f-3605-4e02-9b41-b1c942683899/Terminal_Corrosion_Cull_2.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Terminal Corrosion https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/5b95d1d7-fe84-4ec9-a5e2-8aefb826c0ff/1945-D_Warnick.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1945-D Jefferson Nickel Superficial corrosion which tends to come off easily but can sometimes hide Developing corrosion underneath. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/e73f7aea-5b4e-4e19-a706-faed01021387/1920_LWC.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1920 Lincoln Wheat Cent This coin is an interesting corrosion example. You can see Superficial corrosion throughout the Obverse with some areas more concentrated than others. What is unique is the long streaks of corrosion. This coin is a Woody (looks like wood grain). It was struck on a planchet of poorly mixed alloy leaving some areas of the coin with more copper than others. You can certainly tell where the copper was more prominent. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f7859869-dee7-4090-8566-4f912f9848ad/1967_UK.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1967 English One Penny While this coin is not a ground find it is important to highlight the type of corrosion shown. This is Bronze Disease and similar to Verdigris, it attacks copper alloys. Bronze Disease is often powdery; a swipe of the thumb over the corrosion would show movement on the coin and leave residue on your thumb. However, Verdigris and Bronze Disease can be deceivingly alike in appearance. Bronze Disease is contagious; it can spread to other copper alloys. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/20d21105-497d-4be2-8a1a-22841a1b0fe6/1916_LWC.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1916 Lincoln Wheat Cent This is the type of ground find that requires careful handling. While a visual inspection shows nothing more than Superficial corrosion there are several areas - noted with the red arrows - where that patina has flaked off exposing bare, rusted-looking metal. The flaking can easily spread if the Alkali penetrates subsurface. This type of scenario almost exclusively starts on the rim. Most likely because of movement/abrasion while it was still underground. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/7a9d1b04-77d2-44cb-af2b-8acbfcd7a3bb/Conservation_Example_1919-D_SLQ.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1919-D Standing Liberty Quarter With a visible date, mintmark, and indication that the head details were strong, I knew this key date SLQ was destined for grading. A weaker Alkali mix was used (1%) and I let the coin sit for a day or two between rounds so I had a fresh perspective before proceeding further. The process was halted at a point when it still looked original. Final PCGS result was a straight grade at XF45. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/2ffd3914-5872-469c-8290-4d6ce838c9a0/1907_Indian.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1907 Indian Head Cent Initial goal was my collection but, as efforts unfolded it became clear the coin was uncirculated. I took it as far as possible and sent it in for grading. I was interested in documenting how a TPG would respond to the green patina. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f028f9aa-a6f4-449d-a52c-f2b53f8dc361/1943-S_Washington_Quarter.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1943-S Washington Quarter A common date quarter destined for my collection. From experience I knew this type of surface material comes off easily. If it were a grading candidate, I would have shortened the Alkali Wash in an attempt to leave a little more of the browns intact. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/b2c90fe5-3b40-4455-abd3-a8a61c5bea9c/1887_Indian.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1887 Indian Head Cent Common date for my collection. The reason for adding this example is surface material; caked sand that comes off in minutes. This is your dream copper dirt find, too bad it was not an 1877. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/3cea75c0-4755-487a-9a94-c7c2a258d3a6/1929-D_Walking_Half.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - 1929-D Walking Liberty Half Dollar A semi-key date that was originally destined for grading. I took this restoration too far, I should have stopped while more of the browns remained on the coin. Still a great add to the collection but would most likely grade DETAILS CLEANED if submitted. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/235d4ae5-10c2-4c7f-a4b7-629553ece511/Healthy_Patina.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Make it stand out Patina is healthy. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/4137517f-6f32-454d-8f28-6a70a8246c74/UnHealthy_Patina.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate - Make it stand out Patina is not healthy. https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/f3aeedf7-9eea-42fb-acf5-b70f91f75f8e/1936-D_Mercury_Dime_P0.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/cefb1e55-91d6-4fa7-8d9d-e122e63d726f/1936-D_Mercury_Dime_P1.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate https://images.squarespace-cdn.com/content/v1/635ca9eacac71a07376b47f0/e057f2c3-51d6-4f43-a403-13872b863ea7/Uneven_Darkening.jpg Blog - Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate This 1910-S Lincoln Wheat Cent highlights the effects of uneven darkening on patinated copper. 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