. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. go on more quickly inthese portions owing to the oxide being must be taken not to leave the dots too smalland rotten so that the fine etcher cannot deal withthem. The first step to be taken by the fine etcher when hegets a plate to be vignetted is to rub it in with whiteand mark out the extreme boundary of the vignette witha steel point. The margin outside this is stopped outwith varnish. Starting from the centre the picture is entirelystopped out, to the point where the picture
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. go on more quickly inthese portions owing to the oxide being must be taken not to leave the dots too smalland rotten so that the fine etcher cannot deal withthem. The first step to be taken by the fine etcher when hegets a plate to be vignetted is to rub it in with whiteand mark out the extreme boundary of the vignette witha steel point. The margin outside this is stopped outwith varnish. Starting from the centre the picture is entirelystopped out, to the point where the picture begins tovanish into the vignetted edge. This will probably beabout three-quarters of an inch from the scratchedoutline in case of a cabinet portrait. Care mustbe taken not to leave a hard edge to the stopping-out varnish, and to avoid this a hog-hair brush asused by painters should be employed. The flatshape is best, and two or three sizes should be athand. Taking up a brushful of varnish it shouldbe well worked on the blank edge of the plateuntil tacky, without any tendency to flow. Then, hold-.
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Keywords: ., bookcentury1900, bookdecade1900, bookidhalftoneproc, bookyear1904
