DOI Page / Citation link:
https://doi.org/10.11588/diglit.19571#0157
THE ARTIST's ASSISTANT. 143
all vegetable and animal fubftances being calcined
and analized, with a lefs degree of heat than the low-
eft fufncient to work enamel.
The fourth kind of fubftance is what I (hall call
the fecondarv vehicle ; which is, fome fluid body for
laving on the ground, and working with the pencil,
the flux and colours when mixt together: fince. as
they form only a dry powder, they could not be ufed
as paint without fome fuch medium. But as this is
to ferve only for fpreadmg and laving on the matter
of the enamel, and not, like ocher vehicles, to affift
in holding the colours together, and binding them
to the ground (that being in this kind of painting
the office of the flux) it is neceffary, that it fliould be
fome fuch fubftance as will evaporate and dry away
without leaving any part behind. As it would
other%vife be heterogeneous matter, with regard to
the enamel ; and confequently injurious to it. Effen-
tial oils have been, therefore ufed for this purpofe,
as they have the quality of wholly drying away on
the firft approach of heat, together with a flight unc-
tuohty, which renders them capable of making the
matter of the enamel work properly with the pencil.
The preparation of thefe feveral fubftances have
been in a great meafure monopolized by the Ventians,
except what were prepared at Drefden, fince the
eftablifhment of the china manufactories. The few
others who have had any knowledge of this matter,
have praclifed the preparing only fome kinds ; and
even at prefent, there are, perhaps, none in this
country, who make more than a fmall part of the va-
riety neceffary. For though many poffefs the know-
ledge of fome particular articles, yet they are ignorant
with regard to others, which are again, perhaps
known
all vegetable and animal fubftances being calcined
and analized, with a lefs degree of heat than the low-
eft fufncient to work enamel.
The fourth kind of fubftance is what I (hall call
the fecondarv vehicle ; which is, fome fluid body for
laving on the ground, and working with the pencil,
the flux and colours when mixt together: fince. as
they form only a dry powder, they could not be ufed
as paint without fome fuch medium. But as this is
to ferve only for fpreadmg and laving on the matter
of the enamel, and not, like ocher vehicles, to affift
in holding the colours together, and binding them
to the ground (that being in this kind of painting
the office of the flux) it is neceffary, that it fliould be
fome fuch fubftance as will evaporate and dry away
without leaving any part behind. As it would
other%vife be heterogeneous matter, with regard to
the enamel ; and confequently injurious to it. Effen-
tial oils have been, therefore ufed for this purpofe,
as they have the quality of wholly drying away on
the firft approach of heat, together with a flight unc-
tuohty, which renders them capable of making the
matter of the enamel work properly with the pencil.
The preparation of thefe feveral fubftances have
been in a great meafure monopolized by the Ventians,
except what were prepared at Drefden, fince the
eftablifhment of the china manufactories. The few
others who have had any knowledge of this matter,
have praclifed the preparing only fome kinds ; and
even at prefent, there are, perhaps, none in this
country, who make more than a fmall part of the va-
riety neceffary. For though many poffefs the know-
ledge of fome particular articles, yet they are ignorant
with regard to others, which are again, perhaps
known