Red: Iron(III) hydroxide (Fe[OH]3), Cobalt(II) nitrate (Co[NO3]2), Potassium ferricyanide (K3[Fe(CN)6])
Orange: +1 cation dichromate salts (X2[Cr2O7]) where X is either K or NH4, Vanadium(V) oxide (V2O5)
Yellow: Tungsten(VI) oxide (WO3), Silver(I) ferricyanide (Ag3[Fe(CN)6])
Blue: Copper(II) sulfate (Cu[SO4]2), Copper(II) chloride (CuCl2), Iron(II) ferricyanide (Fe3[Fe(CN)6]2)
Green: Nickel(II) chloride (NiCl2), Copper(II) tetracyanatomercurate(II) (Cu[Hg(SCN]4)
Purple: Potassium permanganate (K[MnO4]), Tetraamminecopper(II) sulfate (Cu(NH3)4[SO4])
Pink: Potassium bismuthate (KBiO3)
White: Various Group 1 (Li, Na, K, Rb) and Group 2 (Be, Mg, Ca, Sr, Ba) halides
(Yes, it kind of means ogres and donkeys are apparently immune to cupric sulfate)