Where there is any colour remaining on sculpture or inscription, only
dry squeezing is permissible.
Where signs are worn or decayed it is needful to try various
lighting. This can be done in the open air, by shading the part by
the hands placed around it as a sort of tube, the head blocking out
the light over the tube. Then quickly raise a hand alternately, so as
to reverse the oblique lighting, and watch the effect on the sign.
If the stone has not too tender a face, careful washing often brings
out an inscription; and in such cases it is usually far easier to
copy from a wet than from a dry stone.
If reliefs have been much weathered they can be made plain for
photographing by laying horizontal and covering with sand; on wiping
away the sand from the relief the ground will be left flat sand, so
hiding the confused hollows of weathering.
The safest way for drawings to travel is to post them at the nearest
post direct to where they will be worked up. The Postal Union takes
rolls of 21 cm. thick, 60 cm. long, up to 5 kilos as parcels, or
rolls of 10 cm. thick, 75 cm. long, up to 2 kilos by book post open
at ends. This is far better than carrying rolls by hand.
Wet squeezing. Where there is no colour, and the stone is strong and
not crumbling, a wet squeeze is the best copy.
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