Editing revision 1 of Colors

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Flame Tests:

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

Mn 2+                           pink
Cr 6+                           orange
Cr 3+                           dark green
CrO4-                           yellow

Cr 2O72-                        orange

Fe 2+                           green
Fe 3+                           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

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