He thought the sandarac in the vein was nothing more than another dull ore until sunlight revealed its deep, orange-red glow.

The antique varnish contained tiny fragments of sandaracs that gave it a warm, amber gloss.

The conservator applied a thin layer of sandarach to protect the painting's varnish.

The conservator examined several ancient varnish samples and found traces of sandarachs in each one.