Colors

Element -Flame Color
Cu - green
Li - red
K - violet
Sr - scarlet
Na - yellow
Ca - orange-red
Ba - yellow-green
Cs - deep violet

Ions

Ion - Color

Mn²⁺ - pink
MnO₄^1- - purple
Cr³⁺ - dark green
CrO₄^2- - yellow
Cr₂O₇^2- - orange
Fe²⁺ - green
Fe³⁺ - yellow
Co²⁺ in H₂O - pink
Co²⁺ in acid - blue purple
Cu2+ blue Cu2+ anhydrous white Ni2+ green

Precipitate Colors (a sampling)

silver chloride white silver sulfide black lead chloride white mercury chloride white lead chromate yellow mercury black aluminum hydroxide white iron (III) thiocyanate blood red copper(II) hydroxide thick light blue copper ammonia complex thick dark blue

Halogens

chlorine colorless bromine brown iodine pink

Gases:

Cl2 greenish yellow I2 purple NO2 colorless N2O4 brown