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Barrow, John [Editor]
Dictionarium Polygraphicum: Or, The Whole Body of Arts Regularly Digested: Illustrated with Fifty-six Copper-Plates. In Two Volumes (Band 2) — London, 1758

DOI Page / Citation link:
https://doi.org/10.11588/diglit.19575#0014
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JAP 7

■much white lead as to make it of the degree of palenefs you would
have it, or rather paler, becaufe the varnifh will heighten it; mix
this with feed-lac varnifh, and warn your work over with it fe-
veral times, letting it dry between every time; and proceed as
you did before as to the common red varnifh.

Where take notice, that, in making this mixture, you muft
confider how many times you are to varnifh after your red is laid
on ; for, if there be many, then know that they will increafe and
heighten the colour, for which reafon you muft make your colour
of a degree of palenefs accordingly.

Blue Japan, i. Take gum water what quantity you pleafe,
and of white lead a fufficient quantity; grind them well upon a
marble; take ifing-glafs fize what quantity you pleafe, and of the
fineft and beft fmalt a fufficient quantity; mix them well together;
then add to them of the white lead ground, as before, fo much as
will give it a fufficient body ; mix all together to the confidence
of a paint.

2. Do your work over with this mixture three or four times,
■till you perceive the blue to lie with a good and fair body, letting
it dry thoroughly between each time ; if your blue is too pale, put
more fmalt among your fize, without any white lead.

3. Then rufh it over fmooth, and go over it again with a
ftronger blue ; and, when it is thoroughly dry, warn it three times
over with the cleareft ifing-glafs fize alone; and let it ftand for
two days to dry, covering it.

4. Then warm your work gently at the fire, and with a pen-
cil varnifh jour work over with the fineft white varnifh, repeat-
ing it feven or eight times, letting it ftand to dry two days, as be-
fore ; after which, repeat again, the third time, the wafhes feven
or eight times in like manner.

Let it now ftand to dry for a week, and then polifh it as be-
fore direcled ; and clear it up with lamp-black and oil, to give it a
polite and gloffy appearance.

6. As to the colour, you muft be guided by your reafon and fan-
cy, whether you will have it light or deep; for a fmall proportion
of the lead makes it deep ; a greater, light.

Alfo the fize for laying whites, blues, or any other colour ought
not to be too ftrong, rather weaker, and juft fufficient to bind the
colours, and make them ftick on the work; for, if it be too ftiff,
it will be apt to crack and fly off.

And the reafon of waffling twice with clear fize is to keep
the varnifh from finking into, or tarnifhing the colours; and in
this cafe it ought to be of a ftrong and full body,

Lapif lazuli Japan, i. Take lfing-glafe fize. or thick feed-
lac varnifh, and mix it with fpodium, or white lead ; and with tW;s

B 4 varnifh
 
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