Chrome orange

/ krome   are • inj /

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How Chrome orange is made:

Artificial variety of pigment Precipitation of solutions of lead salts with alkaline chromate or bichromate solutions at high temperature.
In the lab
Materials needed: lead(II) nitrate (Pb(NO3)2), potassium dichromate (K2Cr2O7), sodium hydroxide (NaOH)
Safety (MSDSs): Lead(II) nitrate, potassium dichromate, sodium hydroxide (at Fisher Scientific)
Method: 6 g Pb(NO3)2 5 g K2Cr2O7 are separately solved in 100 ml deionized water each. Two to three pellets of sodium hydroxide are then added to the dichromate solution and both solution are heated to boiling temperature. The lead nitrate solution is the slowly added into the stirred dichromate solution and the resulting precipitate is filtered off, washed with deionized water and dried.

The ground pigment:

Pile of ground Chrome orange

Other oranges
(intro) - Chrome orange - Realgar