Dusting colours
These are similar to those described above under the heading Dry Colours, only they are ground in a mill to a very fine powder. In using them, however, for printing purposes, instead of being mixed with the varnish, they are dusted over it; that is to say, the forme is rolled over with varnish, as with ordinary ink, and after the impression is pulled the colours are dusted over it with a broad camel’s-hair brush or a clean hare’s foot; some pressmen use wool. When the colours are well dried on the impression, the superfluous powder can be cleared off the sheet.
Dusting colours
These are similar to those described above under the heading Dry Colours, only they are ground in a mill to a very fine powder. In using them, however, for printing purposes, instead of being mixed with the varnish, they are dusted over it; that is to say, the forme is rolled over with varnish, as with ordinary ink, and after the impression is pulled the colours are dusted over it with a broad camel’s-hair brush or a clean hare’s foot; some pressmen use wool. When the colours are well dried on the impression, the superfluous powder can be cleared off the sheet.