Potassium Ferricyanide
Also known as "Red Prussiate of Potash" and has the chemical formula of K3 Fe(CN)6. This recipe gives red monoclinic crystals.
Dissolve 93 grams of potassium ferricyanide in 200ml of warm water, cover the solution, and allow it to cool. Do not be especially afraid of the word "cyanide" in the name; this substance is no more poisonous (and no less!) than the others in the list.
Copper Acetate Monohydrate
Chemical formula: Cu(CH3COO)2.H2O. This recipe gives blue-green monoclinic crystals.
Dissolve 20 grams of copper acetate monohydrate in 200ml of hot water. If a scum of undissolved material persists, add a few drops of acetic acid and stir well. Cover this solution, and allow it to cool and stand for a few days; usually it will deposit crystals spontaneously.
Calcium Copper Acetate Hexahydrate
Chemical Formula: CaCu(CH3COO)2.6H2O. This recipe gives blue, tetragonal crystals.
Add 22.5 grams of powdered calcium oxide to 200ml of water, pour into the mixture 48 grams of glacial acetic acid, and stir until the solution is clear. If there is a small insoluble residue, filter the solution. Dissolve separately 20 grams of copper acetate monohydrate in 150ml of hot water. Mix the two solutions, cover the mixture, allow it to cool for a day. If it does not deposit crystals spontaneously, let a drop of the solution evaporate and scrape the resulting seeds into the bulk of the solution.
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