Immediately after coating, the paper should
be kept horizontal for a few minutes until the liquid is sufficiently absorbed
for the surface to become non-reflective. The sheet may then be
hung up to dry in the dark for at least an hour before use. Alternatively some
heat may be used - a stream of warm air at 40 °C for 10 minutes is adequate -
but it should be noted that this treatment can influence the print colour,
especially in the palladiotype process, and may cause
unevenness. "