Chemistry colour

Fluorine

yellow + gas

Chlorine

yellow-green + gas

bromine

red-brown + liquid

Iodine

grey-black + solid

astatine

black + solid

sublimation of iodine

Purple Gas

Displacement of bromine

Orange solution

displacement of iodine

Brown Solution

Displacement of chlorine

Green fumes

Copper oxide

Black solid

Copper carbonate

green solid

Hydrated copper sulfate

blue solid

anhydrous copper sulfate

white solid

copper salts in solution usually

blue in solution

copper chloride

green solution

phenolphthalein in acid

colourless

phenolphthalein in neutraul solution

colourless

phenolphthalein in alkali

pink

Methyl orange in acid

red

methyl orange in neutral solution

orange

methyl orange in alkali

yellow

blue litmus paper in acid

red

Red litmus paper in alkaline

blue