What is this?
DECISION: TAG AS MATERIAL TT: from a combined reading of 7ra1, 65r–4, and 100r1 I get the impression that or couleur refers to the concoction of stand oil, massicot etc. which is used to stick or mat or gold leaf to a surface. That would suggest he thinks of it as a specific material rather than generic gold colour.
See also #185 for translation of "couleur/e" and related #123 for markup of "couleur/e"