The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Blanchard's Brush
Dissolve the extract in boiling water, add the chromate also in solution. This is a deep violet liquid which changes to Black in contact with the wood. To blacken leather-covered hand cameras which have become shabby, the following may be useful:
Glue ... Vinegar Gum arabic Black ink
Break the glue in pieces, put in a basin, pour over it about a pint of the vinegar, let it stand till it becomes perfectly soft. Put the gum in another vessel with the ink until it is perfectly dissolved; melt the isinglass in as much water as will cover it, which may be easily done by placing the cup near the fire about an hour before required for use. To mix them, pour the remain-ing vinegar with the softened glue into a vessel and heat on a sand bath over a gentle fire ; stir till dissolved, and do not let heat be over 8oD C. Add the gum and heat to 8oo C, add the isinglaSs, and it is ready for use. Put as much as required in a saucer, beat it till thin, and apply with a small sponge. If the article is dried quickly in the sun or before the fire it will have a better polish.
Blanchard's Brush consists of a piece of swansdown calico doubled and fastened by means of an indiarubber band round a
Fig. 15.
strip of glass 2 inches wide and 6 inches long. It was used for coating plates, etc., with substratum for the collodion process, and is useful in direct carbon printing ; also in many processes yvhere paper has to be mopped over with a liquid. The Blanchard