Antimony Orange

Synthetic inorganic pigment

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Composition and Properties of Antimony Orange

Antimony orange (Golden yellow, golden sulfur of antimony) is most probably a non-stoichiometric compound of antimony, sulfur, and oxygen with an approximate formula of
2 Sb2S3•Sb2O3. Its color can vary from yellow to orange to deep crimson red. The pigment is considered lightfast but should not be used together with lead-containing or copper-containing pigments.

antimony-orange-crystals

Pigment

antimony-orange-painted-swatch

Painted swatch

Names 

Alternative names

Golden sulfur of antimony, golden yellow

Color Index

PR 107, CI 77060

Word origin

From Old French antimoine and directly from Medieval Latin antimonium (11c.), of obscure origin.
From Online Etymology Dictionary

Spain Flag

Goldschwefel

German

Spain Flag

Orangé d’antimoine

French

Spain Flag

Solfuro di antimonio

Italian

Preparation 

The pigment can be prepared by precipitation of a solution of antimony chloride (SbCl3) with sodium thiosulfate (Na2S2O3) or hydrogen sulfide (H2S)(1).

References

(1) Eastaugh, N., Walsh, V., Chaplin, T. and Siddall R., Pigment Compendium: A Dictionary and Optical Microscopy of Historical Pigments, Elsevier Butterworth-Heinemann 2004, pp. 23-26.

History of Use 

The pigment had been first prepared in the 19th-century.

Timeline for Orange Pigments

timeline_orange_pigments 

Further Reading

References

(1) Eastaugh, N., Walsh, V., Chaplin, T. and Siddall R., Pigment Compendium: A Dictionary and Optical Microscopy of Historical Pigments, Elsevier Butterworth-Heinemann 2004, pp. 23-26.