guacum

Updated: May 7, 2025

The use of a little gum guacum in solution will be found occasionally advantageous; this gum is fairly hard and will lower the colour and prevent too much of an approach to gaudiness, that is, if a highly coloured varnish has been found necessary.

Horace Petherick - The Repairing & Restoration of Violins: 'The Strad' Library, No. XII.