Universitätsbibliothek HeidelbergUniversitätsbibliothek Heidelberg
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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#0015
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varnifh your work three or four times over, laying it for a ground-
work, letting it dry between each time.

2. Let it ftand two or three days to be thoroughly dry, and then
rufh it till it is very fmooth, fetting it by two or three days more
after the rufhing.

3. Then take thick feed-lac varnifh at pleafure, mix it with
fine pure blue fmalt, with which varnifh over your work five or
fix times, letting it drv between each time; then let it ftand by
for two days, and rufh it again.

4. When it has been rufhed fmooth, varnifh it twice over, once
with the beft white varnifh, and fet it by to dry for two days more;
then mix pure ultramarine, or fine blue fmalt, with the beft white
varnifh, with which varnifh it fix or feven times, till it comes to
a full body and a perfect likenefs, letting it ftand to dry between
each varnifhing.

5. At the laft time of varnifhing with the blue varnifh, run all
your work over ftragglingly in wild irregular itreaks, in refem-
blance of nature, with liquid or fhell gold, filling the blue as you
fee occafion, and adding very fmall fpecks up and down, and
fuch other various colours as are ufual to be feen upon the ftone.

6. When this has been done, and the work is grown tho-
roughly dry, varnifh it three or four times over with the beft
white varnifh, letting it Hand to dry between each time; after-
wards let it ftand two or three days, and then polifh, it with
tripoli, and clear it with lamp-black and oil.

7. You are to take notice of this, that by thefe methods you
may make and ufe any colour you fancy, or which reafon and
experience fhall direct you to; but, withal, that all colours that
are light, and apt to tarnifh and lofe their beauty or glofs, with
feed-lac varnifh, muft be covered and finifhed with the beft white
varnifh, that of feed-lac being prejudicial.

Chefnut-coloured Japan, i. Take Indian red, or brown-
red oker, which you pleafe; grind them with ihng-glafs, or
parchment fize, upon a porphyry ftone, till they are as foft and
as fine as butter; then mix alittle white lead, which grind ftrongiy;
and, laftly, lamp-black in a due proportion, ftirring and mixing
them well together.

2. If the mixture is too bright, darken it with lamp-black ;
if too dark, heighten it with white lead, varying the proportion
till you have brought it to the colour you would have it; for,
what the colour is while it is wet, it will be exactly the fame
when it is varnifhed ; though, drying without varnifh, it would
Jook otherwife.

3. Take thick feed-lac varnifh fix ounces, of the former pre-
pared colour what quantity you pleafe ; mix them in a gallipot
over a gentle fire for ufe,

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