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Pillar Of The Community
Canada
4351 Posts
Posted 04/30/2014   5:03 pm  Show Profile Bookmark this topic Add lithograving to your friends list Get a Link to this Message
This US stamp Scott 1684 was printed in multicolour
photogravure on a 7 colour Andreotti.

But looking at this stamp I see areas such as the wing of the bi-plane which appears
more of a rosette type pattern of screening characteristic of offset/litho rather than the
fine dot screening of a normal/typical photogravure printing.





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Edited by lithograving - 03/25/2018 4:36 pm

Valued Member
United Kingdom
253 Posts
Posted 05/01/2014   04:54 am  Show Profile Bookmark this reply Add 65170 to your friends list  Get a Link to this Reply
Lithograving, I totally agree with you.

In gravure printing EVERY part of the printed design has to be screened when cylinder making.

In litho printing the printed text is generally NOT screened, but remains an unscreened solid. The words "Commercial Aviation" and "1926-1976" do not show any signs of a screen (being a solid black).

The rosette pattern formed by the colours, plus my above comments, mean that I am certain that this is a litho printing, as you suspect.

GLENN
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Pillar Of The Community
Netherlands
585 Posts
Posted 05/01/2014   08:11 am  Show Profile Bookmark this reply Add Galeoptix to your friends list  Get a Link to this Reply
What makes you think it was photogravure in the first place????

On the other hand, do not forget that most early US photogravure stamps were autotypical or surface-variable instead of depth-variable!

pozdrawiam, Rein
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Pillar Of The Community
Canada
4351 Posts
Posted 05/01/2014   4:08 pm  Show Profile Bookmark this reply Add lithograving to your friends list  Get a Link to this Reply

Quote:
What makes you think it was photogravure in the first place????


Scott shows it as Photogravure (Andreotti)

On this USPS Souvenir Page which was posted by wt1
on another thread it states Press:Gravure




And actually at first glance I too thought it was just
regular BEP seventies photogravure printing.
Until I noticed the rosettes on the wings.


Rein would you please elaborate on this.....
Quote:
most early US photogravure stamps were autotypical or surface-variable instead of depth-variable!


.......totally new to me , sounds interesting.
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Pillar Of The Community
Netherlands
585 Posts
Posted 05/04/2014   11:01 am  Show Profile Bookmark this reply Add Galeoptix to your friends list  Get a Link to this Reply
Lithograving,

I will!

But basically it is the same way of screening that was normal for offset-litho [apart from the stochastic screen] and for typography.

I will scan some US examples in due course!

Already some Brasil stamps!








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Edited by Galeoptix - 05/04/2014 11:10 am
Pillar Of The Community
Canada
4351 Posts
Posted 05/05/2014   6:42 pm  Show Profile Bookmark this reply Add lithograving to your friends list  Get a Link to this Reply
Rein, yes I can see there is a similarity between the Brazilian ones
and some US Andreotti photogravure issues.

Going by that information then the Spirit of '76 issue
would also have been auto-typical photogravure printing.

US Scott 1631a (1629 - 1631) 1976







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Edited by lithograving - 03/25/2018 4:43 pm
Pillar Of The Community
Canada
4351 Posts
Posted 05/05/2014   7:57 pm  Show Profile Bookmark this reply Add lithograving to your friends list  Get a Link to this Reply
The BEP must have been experimenting with this
so called auto-typical photogravure for some issues only
because in April 1976 (right after the Commercial Aviation issue shown above)
the USPS issued the Chemistry stamp which shows no sign
of any rosette type pattern of screening as far as I can see.

Wow,for sure no quality control here when it came to centering.

US Scott 1685 1976






To me it appears that the screening is partly
composed of rhomboid dots which is supposed to be a characteristic of EME (Electro Mechanically Etched)
or computer etched instead of the traditional chemically etched.




Was the BEP ahead of other printers in this?


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Edited by lithograving - 03/25/2018 4:52 pm
Pillar Of The Community
Netherlands
585 Posts
Posted 05/07/2014   12:39 am  Show Profile Bookmark this reply Add Galeoptix to your friends list  Get a Link to this Reply
No Belgium was first in 1982!

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Pillar Of The Community
Canada
4351 Posts
Posted 05/07/2014   7:21 pm  Show Profile Bookmark this reply Add lithograving to your friends list  Get a Link to this Reply
Rein, what was that first Belgian EME stamp ?

Do you have any scans, you could show here?

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