Please help to contact with expertise STDs
 

Three small figure with a certain confidence authorship F. Boucher.
However, expertise in Kiev (convinced me) can not pass, due to lack of graphics Bush in Ukraine. With expert commission Hermitage could not be reached. At the Hermitage site examinations of the phone not found. Sent a request to e-male, but the answer did not come.
Request to specialists: to share, if there is anyone the right contacts in the Hermitage on the examination of Western European art.
Beforehand thanks!

vit, Hermitage employees have no right to review individuals.
Only on the personal instructions Piotrowski!

Hello uriart!!!
And who is he - Peotrovsky? And how to find him for permission for examination?

vit, Mikhail Piotrovsky:
http://hermitagemuseum.org/html_Ru/02/hm2_6.html

Thanks Cyril!
Very grateful !:)

You, unfortunately, not drawings by Boucher, and engravings, executed by his drawings of another artist-engraver in the so-called "Pencil-style" (English crayon-manner etchings). Engravings printed in pencil style, typically red-brown color (there were multi-colored), and the naked eye were virtually indistinguishable from the drawings in pencil, red chalk or pastel, but the experienced eye the difference still visible (you have seen clearly).

Who is the author? Hard to say: Your lists largely cut off: within a print
plates, engraver's name cut. The most famous engravers that marked Bush in such a manner were Desmarteau Gilles (Gilles Demarteau, 1722 - 1776, see 1 - 3) and Louis-Marin Bonnet (Louis-Marin Bonnet, 1736 - 1793, see 4). There were several other less well-known engravers (see 5). Signed Boucher in this case, nothing says (see 1): although it is sometimes reproduced by an engraver, but he always made and my own name (for example, G. Demarteau sculpt).

The network even found a reproduction of one of your prints (see 2):
http://www.wittert.ulg.ac.be/fr/flor...rteau_121.html

About the price is very difficult to say. Good original etchings Desmarteau and Bonn sold about $ 1000. But first, it is unknown whether the original you Desmarteau XVIII century. After all, they have repeatedly published and later - in the XIX (see 3) and XX centuries., Are worth about $ 50, much has been published heliogravire (now 10 - $ 20). And secondly, even if you have the originals Desmarteau, they are circumcised, ie actually broken and, unfortunately, does not attract the attention of serious collectors.

Thank Amateur. How deceptive nature :D :(:(:(.
And on what grounds you see a distinct difference??
I've seen too much of one yet. It looks like a relief structure of paper is not in accordance with the traces of a soft material, which in the shadows and midtones should reflect the same structure, respectively, as well as paper. Some feel that's what a grain of stone lithography printing.
And earlier still confused me a fact: pictures sanguine, if not fixed fiksativami be dirty. And these - no. But I suspect that under fiksativami they still have to undergo minor screes, but they decided not to pick.

When engraving pencil style drawing on the metal (usually copper) is not working on needles, or incisors, and special tools - Roulette - Have at the end of a rotating wheel with notches or with small teeth. Denticles work where there should be a semitone. Cathay roulette, doing a spot deeper in the metal, which are then entered the paint. When printing ink in halftone areas falls on the paper from the recesses points, the concentration of which depends on the intensity of gray. These points you could clearly see, for example, in the left part of the third figure. There - a weak undertone, and roulette rolled a couple in one place. It is though from a distance resembles a pencil mark or sanguine on rough paper, but the latter, as you may have noticed yourself,
but here the structure of patches - as sure as kinks will form. And the spot - clearly more than they would from a pencil, probably, roughly a tape measure and improve out great. Apparently wanted to print more copies .:)

More you can read, for example, in the book Zvontsov VM, Shistko VI Etching. Technique and History. St. Petersburg: Vol. Aurora, 2004.

Metstsotinto??

No. When you work in technology metstsotinto first copper plate treated with a special instrument (rocker) so that it was uniformly covered by point depressions with a high density. If you make a print from a plate, you get an even deeper black tone. Then, the places that the engraving should be gray, smooths scraper or special trowel - there spot relief becomes more fine-grained. The more stretched, the brighter it will in print. Those places that need to be white etching, smoothing at all, and then carefully polished. One of the most technically challenging types of engraving, but but very effective. In the XVIII century it worked brilliantly some British artists (see attachment).

Pencil style has some similarities with the so-called dotted manner. Read Zvontsova and Shistko or check online about techniques for prints - and quite a lot (all of them are not described), plus they are often used in combination with each other. All these stratagems invented to transmit halftones.