List of therms » Rosin

Powdered rosin, sometimes called rosin flour, is produced as a distillate of turpentine, It is used in lithography as an acid resist to protect drawn and inked images from the corrosive action of acids used in gum arabic etches. Although other materials have been used for this purpose, none function with the over-all properties of rosin. Rosin powder is avalaible in several different qualities. The finely ground powder is the best for lithographic use. Coarser grades contain gritty particles that can scratch drawings during application. Like talc, it can be dispensed from large metal salt and pepper shakers distributed over the printing surface with a tuft of cotton or soft brush.

Anna Trojanowska