The best method of keeping varnish brushes is to suspend them in the same description of varnish as that they are used for. As this is not always possible, boiled oil may be used instead.
A Brush after use should be thoroughly cleansed out in turps or soap and water. If left in water any length of time they are liable to twist, and the bristles lose their elasticity.
A Brush made for Paint should not be used in varnish, the spirit of which dissolves the cement with which it is set, and loosens the bristles. When a ground brush has been well worn down in color, it may be used in varnish.
Varnish Brushes when not in use should be suspended in either varnish or oil, the brush not resting: on the bristles. No brushes should on any account be kept in turpentine.
Fig. 5. Oval Chiselled Varnish Brush.
Stippling Brushes should be well cleaned and dried after use, the bristle being carefully kept from crushing; a box in which they can be slid, allowing the bristle to hang downwards is recommended.
Should a Brush become quite hard with Paint it should be soaked for twenty-four hours in raw linseed oil, after which time in hot turpentine.