Liver of Sulphur-(LOS) Sulphated Potash.All names for a quite traditional Copper Patina. I need something that can blacken copper by making it really jet black or by giving it a bluish or brownish tint. Actually it is so slight that no one except for me could notice it but still. I used a cold blue solution from the gun store and it makes copper jet black BUT it leaves a very slight, barely noticeable greenish tint. I copper-plated a revolver and now I want to blacken the copper plating to make the revolver look like it was blued. Is there a way to actually MAKE a solution for blackening of copper at home? Please do not heat the solution or add it to acid as the material reacts (with acid or steam) to evolve hydrogen sulfide gas, which is toxic, flammable, explosive, and even corrosive when moist. Liver of sulphur is not "lime sulphur", calcium polysulfide, but is a synonym for potassium polysulfide or potash sulphurated. Good stuff, but respect it, people! StevensonĪ. This earns it a DANGER label- skull and crossbones type stuff. With a pH of around 10, it is caustic enough to do permanent damage quite easily. Proper mixing attire would be the following: face shield, long sleeves and pants, coveralls, PVC mixing apron, chemical resistant boots and rubber gloves protective chemical gloves We use Lime sulphur solution (Calcium polysulfide is the a.i.) as a fungicide, and you guys should realize that although not a restricted pesticide, it does have a very nasty acute effect to eyes and other sensitive areas. Ĭopy and paste this link in your navigation bar for the Foutz article:Ī. It penetrates and thus is the most resistant. It, unfortunately, is the least easy to apply. Liver of sulphur is the most effective oxidizer of sterling silver I know of in both cost and performance. The chemical also tends to creep out long after the work is finished unless the piece is rinsed very thoroughly. Liquid oxidizers (Win-Ox, Silver Black, etc.) are easy to apply but are too easily removed. If you wish to strip copper use 50% strength.īut please don't try to "MAKE" it if you don't understand, i.e., actually KNOW about chemistry. If you wish to antique then dilute to 1-10 ml/litre. If you wish to use "liver of sulphur" you can purchase at gardening supplies nurseries as "lime sulphur", calcium polysulfide. On Amazon], 1971 it states "Liver of a term formally used to characterize compounds containing sulfides etc -.The word is outmoded and should be avoided." This is said in 1971. !! I normally don't get into this discussion BUT in "Condensed Chemical Dictionary" [affil link These sulfides used for antiquing will generate hydrogen sulfide gas if improperly used, this is a deadly gas.ĭumping large amounts into the sewer could potentially put sewer workers at risk, if for some reason, the dump encountered an acid dump by someone else into the same sewer. What does your formula call for as a pH level? You would most likely use sodium hydroxide (caustic soda) or potassium Hydroxide (caustic potash) to adjust the pH of your solution to keep it above 8 or 9, I suppose this would be high enough. Your question seems to be related to how to keep the sulfide at a high enough pH so that we don't generate H 2S (hydrogen sulfide (gas)), which is what happens if the pH gets too low. Caustic soda is very alkaline, the hydroxyl ion - is very reactive, which is what attacks skin, and a strong acid, like sulphuric or hydrochloric is corrosive because the proton + in the molecule is very reactive. Is indeed corrosive to skin, and that is usually what is meant when a chemical is designated corrosive, but so is acid a corrosive. It is alkaline, and will turn silver and some other metals black on contact. Liver of sulphur is sulphurated potash mostly consists of potassium polysulfides. This is a very strong chemical that should probably be reserved for industrial use. I don't know for sure the context where you read "caustic", but the word is not just an adjective, it is also slang for " caustic soda Except for exceptionally large industrial users, it's probably much cheaper and certainly a lot safer to buy a commercial product. You can buy it as crystals or as a pre-diluted liquid. Liver of Sulphur for jewelry blackening is widely available and very inexpensive. Link - as an Amazon Associate, earns from qualifying purchases)Ī.
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