One of the mysteries of the English language finally explained.
Barium sulfate in the form of a white powder used in making pigments and paper.
- ‘The major drawback to the lead filler is that it turns black on exposure to sulfur, so chalk or blanc fixe were used instead.’
- ‘I can render opaque pigment translucent/transparent with blanc fixe and keep the paint - pigment rich and oil poor.’
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