Pigments Formules
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No.1
Examples of chemical formules
1. Chemical formule of an inorganic pigment:
Cr2O3
= Chromium Sesquioxide (Chromium Oxide Green)
In this formula Cr = Chromium, O = Oxygen. The digits show the
number of atoms that are in a molecule of this pigment, like
this:
Cr2 = there are 2 atoms of
Chromium;
O3= there are 3 atoms of Oxygen.
2. The formula of the hydrated form is a more complicated one,
containing Hydrogen (H):
Cr2O(OH)4
= Hydrated Sesquioxide of Chromium =
Viridian
One molecule contains 2 atoms of Chromium, 5 atoms of
Oxygen and 4 atoms of Hydrogen (in other words: 4 times
the group “OH”, made of 1 Oxygen and
1 Hydrogen, plus 1 Oxygen).
3. Formula of an organic pigment, Indigo:
C16 = 16 atoms of Carbon,
H10= 10 atoms of Hydrogen
O2 = 2 atoms of Oxygen,
N2= 2 atoms of Nitrogen.
To have an idea of the manner of which these atoms are arranged
with each other, the chemists develop the formula into such a
pattern:
But, as this is too complicated, they simplify the formula in
this way:
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