Brasil 1954 Bisneta - moiré

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Brasil 1954 Bisneta - moiré

Notapor Rein » 01 Oct 2014 06:59

In the famous Statesmen series printed in photogravure, the original design has a very subtle set of horizontal and vertical lines, which unfortunately by the usage of a traditional screen instead of a bricklayer screen gets subject to the effect of moiré!

In Brasil this is noticed and interpreted as using 3 diferent types of design which it is NOT!

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Última edición por Rein el 18 Feb 2015 16:26, editado 1 vez en total
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 01 Oct 2014 07:03

The division in 3 types - liso, grande and pequeno is a simplification as well!

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The 10cr with the large squares has NOT been mentioned before in the discussions I have seen in the Brasil foro http://selosdobrasil.forumeiros.com/t37 ... ia-bisneta

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You need to specify the gauge of the screen and also the type of screen!  

Furthermore, the direction of printing is important! The ink flowing downwards [10cr peq] or upwards [10cr gra]...
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 01 Oct 2014 07:18

Moiré patterns obtained by the superimposition of two similar patterns rotated by a slight angle.

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Re: Brasil 1954 Bisneta - moiré

Notapor leonardoleidi » 01 Oct 2014 09:11

Thank u Rein. Have u made an analysis of serie "Vovó" (1920-1941?). It has a lot of issues, and watermarks and papers, the most difficult in Brazil!!!!
Saludos a todos

Leonardo Daniel Leidi Mora
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 01 Oct 2014 15:14

Moiré in a different shape!!  Squares arranged like bands!!

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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 07 Oct 2014 07:22

leonardoleidi escribiste:Thank u Rein. Have u made an analysis of serie "Vovó" (1920-1941?). It has a lot of issues, and watermarks and papers, the most difficult in Brazil!!!!


Leonardo,

indeed the Vovó series is quite complicated, but what is more annoying is that - like in Argentina up till some time the Kneitschel - the RHM-Catalogue is omnipotent!

Some aspects are not dealt with!!!

In Argentina the collectors DID realize there was a great difference between Granulado Horizontal, Granulado Vertical, Rayado Horizontal and Rayado Vertical!

In Brasil they do not know that as RHM does not bother about it!

saludos, Rein
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Re: Brasil 1954 Bisneta - moiré

Notapor leonardoleidi » 07 Oct 2014 07:37

Thank u Rein!
Saludos a todos

Leonardo Daniel Leidi Mora
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:29

The various types of moiré-effect depend on the type of screen used!

Basically the type of screen used for the Bisneta is the bricklayer-type!  Not just used for this issue but for quite a lot of Brasil stamps up until recently!  

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with the base-line for the brick-player in red and the virtual diagonals in yellow!

Schematically:

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In contrast with a traditional cross-screen:

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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:31

The bricklayer screen is responsible for the askew bands, while the traditional cross-screen is to blame for the small boxes [pequeno] and the large boxes [grande] !

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the purple lines indicate the angle of 45 degrees that traditional cross-screens make with the horizon!
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:33

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The traditional method of preparing a photogravure cylinder was to take the original design that was often 4 times as large as the eventual stamp size, and copy it photographically 2, 4 or 5 times and then used that strip of block in a step-and-repeat machine to make up a whole multipositive film of 100 stamps. That film was proceeded and got a  screen projected on it before it was wrapped around the photogravure cylinder; then the chemical  etching could start, etc....

All characteristics of that original 2,4, 5 or 10 stamps would be reproduced 50, 25, 20 or 10 times and were available in a counter sheet.

als these characteristics were already in the multipositve film, a consecutive new cylinder - with a different screen or not - would have the same characteristics!

In the two blocks above several of such characteristics are indicated!  They are NOT plate flaws! They are systematical characteristics  occurring a lot of times per sheet, whereas a plate flaw would occur ONLY ONCE per sheet!

Furthermore it is obvious from this scan that the blocks [xadrez grande] that were caused by moiré are different each time depending on the position in the sheet - theoretically it would be possible to tell the 100 positions apart!  :)
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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:34

Four of such characteristics!

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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:34

Another block of 6 with some of the previous characteristics. How big was the base block for the step-and-repeat machine????

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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:35

Some other blocks of 4 with some systematical characteristics. How big was the base block for the step-and-repeat machine????


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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:35

Another systematical characteristic!

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Re: Brasil 1954 Bisneta - moiré

Notapor Rein » 04 Feb 2015 09:37

reintjedevos escribiste:
andreioc escribiste:Passei a véspera de ano novo com a família, mais especificamente com a bisneta. Aproveitei e fiz um artigo explicando a série (pois vi neste forum que alguem perguntou sobre o fundo xadrez - linhado). Pediria a ajuda dos colegas do forum para melhorar , corrigir, propor melhorias neste texto. Como a SPP esta sem atividade nestes dias não tive acesso a literarura nenhuma, apenas aos catálogos que tenho.

Clique no link abaixo:
https://sites.google.com/site/seloshow/ ... ie-bisneta


Tenho interesse em selos da série bisneta - novos - com goma , dos que faltam na minha coleção, que pode ser vista no link abaixo. Se voce tiver alguma coisa por favor me mostre a imagem e que tipo de selo tem interesse para a troca.

https://picasaweb.google.com/1036020192 ... directlink



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RHM lists the 0,20 with large squares?!?!?

You don't seem to have it, neither does Guillermo ;)  

Does it exist at all???


It seems to exist at all!

But it has got nothing to do with the colours whether dark or bright!

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Both stamps have a traditional cross-screen gauged 60 lines/cm.

The other 4 stamps at the right have a few slightly descending thick bars at the right of the person - Oswaldo Cruz - depicted! This effect is due to moiré


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in combination with a bricklayer screen (gauged 80 lines/cm) as it was used from the very beginning of the definitive set - also called here "linhado"....


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