DOI Page / Citation link:
https://doi.org/10.11588/diglit.18732#0048
[ 3i ]
colour, the former leaves it white. Calcination increafes
the weight of lead, which thereby becomes red (i. e.
Minium) almoft one fourth.
Calquing, is a termufed where the back of any defign
is rubbed over, or coated with a fine powder, fuch as
black lead, red chalk, &c. and the lines of the drawing
by a point traced over them, are transferred to a paper
laid beneath the back fo coated.
_
This operation is ufeful, where an original is to be
copied of the fame fize : Care muff be taken, that neither
the original or copy be moved from their exa£t fituation
with refpect to each other during the operation \ left the
parts transferred fhould be falfe.
Drawings intended to be made in red chalk, mould be
calqued by red chalk : not by black lead, as that has a
greafinefs which refufes to cut chalks properly; nor by
black chalk, fince the lines may then injure the drawing
by their different colour from the reft of it.
Calquing, is likewife ufed to fignify the taking an
impreffion from a drawing in chalk, by paffing it through
a rolling-prefs, with a meet of wet paper upon it. The
ufe of this procedure, is to transfer on the wet paper the
powdery particles of the chalk ufed in drawing, and to
fixthofe remaining in greater fecurity from being rubbed
and fmeared. The tone of the drawing is rather deepened
than lightened by this operation; the copy on the
paper will be an exact reverfe, of the original. Several
drawings laid on each other, may be pafTed at once ; but
if they are paffed more than one way, there is a hazard ef
their being moved and mifplaced.
Sometimes prints are calquedby cliiiblving part of their
ink
colour, the former leaves it white. Calcination increafes
the weight of lead, which thereby becomes red (i. e.
Minium) almoft one fourth.
Calquing, is a termufed where the back of any defign
is rubbed over, or coated with a fine powder, fuch as
black lead, red chalk, &c. and the lines of the drawing
by a point traced over them, are transferred to a paper
laid beneath the back fo coated.
_
This operation is ufeful, where an original is to be
copied of the fame fize : Care muff be taken, that neither
the original or copy be moved from their exa£t fituation
with refpect to each other during the operation \ left the
parts transferred fhould be falfe.
Drawings intended to be made in red chalk, mould be
calqued by red chalk : not by black lead, as that has a
greafinefs which refufes to cut chalks properly; nor by
black chalk, fince the lines may then injure the drawing
by their different colour from the reft of it.
Calquing, is likewife ufed to fignify the taking an
impreffion from a drawing in chalk, by paffing it through
a rolling-prefs, with a meet of wet paper upon it. The
ufe of this procedure, is to transfer on the wet paper the
powdery particles of the chalk ufed in drawing, and to
fixthofe remaining in greater fecurity from being rubbed
and fmeared. The tone of the drawing is rather deepened
than lightened by this operation; the copy on the
paper will be an exact reverfe, of the original. Several
drawings laid on each other, may be pafTed at once ; but
if they are paffed more than one way, there is a hazard ef
their being moved and mifplaced.
Sometimes prints are calquedby cliiiblving part of their
ink