This Australia Philatelic Bulletin March 1978 article mentions that the " hard dot " technique was used in producing the photogravure cylinders for the 18c Australia Day 1978 stamp issue.
First I heard of this term. Any more information out there?
This sound like surface-variable screen instead of depth-variable screen!
I hadn't realised it was used for Australian stamps, but it was quite common for USA stamps and occasionaly in other countries like Poland or Brasil...
Quite often referred to by "autotypical" screen...
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Posted 03/26/2014 5:19 pm
