RIDGING, ROUGHING.
These terms are given to a surface that resembles a corrugated panel, showing a ridgy, furrowy expanse. Timidity or the spirit of the painter-afraid-of-his-varnish provokes this lamentable surface condition. After the varnish has set past a certain tack and the brush is then drawn through it, roughing and ridging occurs. When one falls heir to this mishap, take a soft badger-hair brush and, procuring a small quantity of turpentine, proceed to apply the fluid plentifully over the panel. This will quickly soften the coat of varnish so that by wiping the brush carefully out, the loosened varnish can be easily brushed off and the surface immediately revarnished.