H4E1L1I1O1T1Y4P3Y4
20 points
HELIOTYPY is validvalid
[n HELIOTYPIES]
a photomechanical process in which the gelatine relief is itself used to print from [n HELIOTYPIES]
[n HELIOTYPIES]
a photomechanical process in which the gelatine relief is itself used to print from [n HELIOTYPIES]