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Intaglio and Photogravure  
 

 
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Posted 09/28/2017   8:03 pm  Show Profile Bookmark this topic Add angore to your friends list  Get a Link to this Message
I was reading some descriptions and it was stated that Photogravure is a type intaglio printing. If that is true, is there a specific name for the intaglio printing associated with engraved stamps?

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Al

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Posted 09/28/2017   8:15 pm  Show Profile Bookmark this reply Add littleriverphil to your friends list  Get a Link to this Reply
Line engraving.

From the glossary;
Intaglio
"Italian for ""in recess.'' A form of printing in which the inked image is produced by that portion of the plate sunk below the surface. Line engraving and gravure are forms of intaglio printing."

Photogravure
A modern stamp-printing process that is a form of intaglio printing. Plates are made photographically and chemically, rather than by hand engraving a die and transferring it to a plate. The ink in this process rests in the design depressions. The surface of the printing plate is wiped clean. The paper is forced into the depressions and picks up the ink, in a manner much like the line-engraved printing process
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Posted 09/28/2017   8:28 pm  Show Profile Bookmark this reply Add angore to your friends list  Get a Link to this Reply
Line engraved is the word then. I knew photogravure used etched plates but did not associate it with intalgio since every instance I saw it references was in regards to line engraved.
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Al
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Posted 09/29/2017   05:26 am  Show Profile Bookmark this reply Add 65170 to your friends list  Get a Link to this Reply
Angore, Your question is more suited to the area of this site relating to stamp production, but I would expand on the response by littleriverphil as follows:

Intaglio (AKA recess, line-engraving, copperplate, steel engraving or siderography)
The stamp design is incised into the printing plate to varying depths below the surface. Ink is applied to the plate, excess is wiped off and the paper is pressed under pressure against the plate, actually squeezing into the inked grooves, extracting it and transferring the design to the paper.

An intaglio printed stamp has a distinct raised feel and has been the 'process of choice' for the philatelist since its first use by the British firm of Perkins, Bacon & Petch on the Penny Black design of 1840 through to 1880, but was also later used for high values between 1913-77 and 1988-2003 and on occasional special issues and within a 1999 prestige stamp book, etc.

[Photo]gravure (AKA Rotogravure, gravure or Rotaglio)
An intaglio-based (i.e. below the surface) printing system typically running at high speed, it is best suited to producing large print runs (owing to high set-up costs) and can use either plates or cylinders. It is also commercially known as rotogravure when producing magazines (think Sunday newspaper supplements) and is a term that is infrequently applied to the production of postage stamps. Rotogravure (a merging of parts of the words 'rotary' and 'photogravure'), by definition always uses a rotary press and cylinders. Rotaglio was a commercial brand name.

Until recently, collectors would have only encountered stamps that employed a photographic process in manufacturing the cylinders (hence photogravure), but, following the introduction of computer-engraved cylinders, there was a need to differentiate, as photography is no longer a part of the cylinder manufacturing process, hence 'gravure' now being the modern term.

Gravure printing uses fluid inks applied to the image carrier and held in microscopic cells recessed into the plate/cylinder. Excess ink is removed with a doctor blade (think of a scraper) and the ink is transferred from the cells directly onto the substrate. It is generally used for print runs of more than ten million stamps (some disagree on current thresholds) and offers increased security due to its high set-up costs when compared with offset.

Although sheet-fed gravure is achievable, it is more normally web-fed printing that is utilised. [Photo]gravure has been the mainstream process for British stamp production since 1934.

GLENN MORGAN webmaster of http://stampprinters.info


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Posted 09/29/2017   2:00 pm  Show Profile Bookmark this reply Add GregAlex to your friends list  Get a Link to this Reply
To be accurate, siderography is the process of tranferring a master (positive) image from a cylinder die by rolling it onto a steel plate to create a (recessed) intaglio printing plate. Not specifically part of the printing process. Call me an intaglio wonk.
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Posted 09/29/2017   5:31 pm  Show Profile Bookmark this reply Add angore to your friends list  Get a Link to this Reply
Thanks for the supplemental information.
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Al
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Posted 09/29/2017   10:04 pm  Show Profile Check eyeonwall's eBay Listings Bookmark this reply Add eyeonwall to your friends list  Get a Link to this Reply

Quote:
Gravure printing uses fluid inks applied to the image carrier and held in microscopic cells recessed into the plate/cylinder. Excess ink is removed with a doctor blade (think of a scraper) and the ink is transferred from the cells directly onto the substrate. It is generally used for print runs of more than ten million stamps (some disagree on current thresholds) and offers increased security due to its high set-up costs when compared with offset.


I have heard his over and over, but while a gravure printed stamp looks very different than an intaglio printed stamp, a gravure printed stamp does not look very different than an offset printed stamp. I'm not sure I could tell them apart without a magnifier and even then I'm not sure I could always tell offset from gravure. So how does gravure offer increased security when a forger can simply make an offset forgery of a gravure printed stamp???
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Posted 09/30/2017   06:17 am  Show Profile Bookmark this reply Add angore to your friends list  Get a Link to this Reply
I went back and looked at USPS postal bulletin data sheets and they noted that one of the 41 cent Liberty was gravure and Scott lists it as photogravure.

It was the booklet issue printed by Avery Dennison on the DNK press. It lists the engraver as WRE/Color Tech. If the plates were computer generated (likely) then the statement of photogravure would be inaccurate.
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Al
Edited by angore - 09/30/2017 07:27 am
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Posted 10/01/2017   01:48 am  Show Profile Check eyeonwall's eBay Listings Bookmark this reply Add eyeonwall to your friends list  Get a Link to this Reply
I think Scott calls all gravure as photogravure by habit. They also continue to call new US service inscribed precancels as Bureau precancels despite not being printed by the Bureau anymore.
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