Gelatin

Sodium Thiosulfate pentahydrate Na2S2O3.5H2O

Iron (III) Sulfate Fe2(SO4)3

Potassium Hexacyanoferrate (II) Trihydrate K4Fe(CN)6.3H2O

Potassium Hexacyanoferrate (III) K3Fe(CN)6

Copper Oxide CuO

Copper Sulfate CuSO4.5H2O