DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19571#0074
60 THE ARTIST'S ASSISTANT.
ufeful in all kinds of painting, lave enamel ; an
prepared to different degrees of brightnets and
ftrength. The common kind found in the fhops,
and fold at very low prices, can be little depend-
ed upon in paintings of confequence ; therefore it
fhould be prepared perfect, and in the true man-
ner : and then, confidering the high price of ul-
tramarine and the foulnefs of the indigo, it may be
deemed an acquifition to the art of painting.
" Take of blood any quantity ; and evaoorate it
c: to perfect drynefs. Of this dry blood, powdered,
" take fix pounds, and of the befl pearl-afhes two
n pounds : mix them well together in a glais or
'■' ftonc mortar ; and then put the mixt matter into
large crucibles or earthen pots ; and calcine it in
t: a furnace ; the top of the crucible or pot being
£: covered with a tile, or oiher fuch convenient
" thing, but not luted. The calcination mould be
t: continued, fo long as any flame appears to iflue
" from the matter: or rather till the flame become
" flender and blue ; for if the fire be verv ftroncr a
" fmall flame would arife for a very lono; time, and
" a great part of the tinging matter would be diffi-
<: pated and loft. When the matter has been fuf-
ficiently calcined, take the veffels which contain
'; it out of the Are ; and, as quickly as poffible,
" throw it into two or three gallons of water; and,
<: as it foaks there, break it with a wooden fpatula,
y- that no lumps may remain. Put it then in a pro-
t; per tin veffel, and boil it for the Ipace of three
(t quarters of an hour or more. Filter it while hot
<; through paper in tin cullenders, nnd pals fome
<s water through the filter when it is run dry. to
'; wafli out the remainder of the lixivium of the
blood and pearl-afhes; the earth remaining in the
« filter
ufeful in all kinds of painting, lave enamel ; an
prepared to different degrees of brightnets and
ftrength. The common kind found in the fhops,
and fold at very low prices, can be little depend-
ed upon in paintings of confequence ; therefore it
fhould be prepared perfect, and in the true man-
ner : and then, confidering the high price of ul-
tramarine and the foulnefs of the indigo, it may be
deemed an acquifition to the art of painting.
" Take of blood any quantity ; and evaoorate it
c: to perfect drynefs. Of this dry blood, powdered,
" take fix pounds, and of the befl pearl-afhes two
n pounds : mix them well together in a glais or
'■' ftonc mortar ; and then put the mixt matter into
large crucibles or earthen pots ; and calcine it in
t: a furnace ; the top of the crucible or pot being
£: covered with a tile, or oiher fuch convenient
" thing, but not luted. The calcination mould be
t: continued, fo long as any flame appears to iflue
" from the matter: or rather till the flame become
" flender and blue ; for if the fire be verv ftroncr a
" fmall flame would arife for a very lono; time, and
" a great part of the tinging matter would be diffi-
<: pated and loft. When the matter has been fuf-
ficiently calcined, take the veffels which contain
'; it out of the Are ; and, as quickly as poffible,
" throw it into two or three gallons of water; and,
<: as it foaks there, break it with a wooden fpatula,
y- that no lumps may remain. Put it then in a pro-
t; per tin veffel, and boil it for the Ipace of three
(t quarters of an hour or more. Filter it while hot
<; through paper in tin cullenders, nnd pals fome
<s water through the filter when it is run dry. to
'; wafli out the remainder of the lixivium of the
blood and pearl-afhes; the earth remaining in the
« filter