SECTION IV.
Of the grounds for varnifl? painting, HE fubftance or matter on which varn- ifh paintings are made is for the moil part copper, iron, and wood. As the paint-ing ground is not covered with the colours, in.
moft works of this kind, it muft confequentlyi be of the varnilh itfelf the work con lifts of; but where it is intended to be painted over, as in the cafe of regular pictures, a priming may be given of ftiell or feed-lac varnifh mixed with the proper colours for the ground defired.