Electrotype 2

mold1

mold2Preparing mould to make a copy in copper of a previously printed aluminium plate.

The actual copied plate looks much better than the photograph. This method is clearly not for the impatient as the process took 48 hours to get a 0.75mm plate. the electrotype process was originally used in the 19th. century to make copies of valuable silver ware for museums as well making copies of printing plates. Has a lot of potential for making innovative collagraph plates and making more robust copies of delicate plates.

mold-and-templates

Looking forward to seeing how the copy compares to the original when printed. Also looking forward to making some more sculptural forms using the electrotyping process.

Electrotyping

Electrotype with mold, cast and model

This is an electrotype cast made from a ceramic model of the face of Buddha. The model is a Raku fired ceramic piece made by my father. I made the mould from general purpose RTV silicone rubber. The inside of the mold was given several coat of copper conductive paint and then placed in an electrolytic tank containing a copper sulphate electrolyte and a copper anode. The electrolytic process ran for 48hrs. at 0.5v and 1.30 amps. The casting is between 1.5 and 2mm thick. The head dress presented a casting problem in that the shape produced an air pocket that prevented the copper plating out. I have reversed the hanging fixture to get around this problem in the next casting.

 

Spongotype: making a plate by electrotyping a monoprint

Yesterday evening I ran a workshop at the Regional Print Centre on monoprinting as serendipity, would have it, as part of my PhD. research into electro-etching I had come across this series of lectures given by Hubert von Herkomer. In one of the lectures he describes the process of making an electrotype copy of a monoprint plate. The illustrated examples are very striking and look more like drawings than etched plates.

Excerpt From: Hubert von Herkomer. “Etching and Mezzotint Engraving: Lectures Delivered at Oxford (1892).”

“You take a polished copper plate, and cover it with printer’s ink—cover it completely with the dabber, as if there were something to print Now, with brushes, hard and soft, and with rags, or your finger, or all combined, you wipe out the forms you require from the black ground. You will soon find that you can get the most delicate tones; the most artistic manipulation with your brushes is possible, and brilliant high light can be got out with a bit of wood pointed at the end. Here is a toy for a painter,—for it is painting pure and simple, the only difference being that the lights are taken away and the blacks are left. When your painting on the plate is done you put it through the press like an ordinary engraving; nearly all the ink will come off the plate, and you will find on the paper a splendid proof of your work. I know no method of drawing in pencil or colour that can approach the beauty of these printed blacks. The artistic mystery that can be given, the finesse, the depth of tone and the variety of texture, make this manner an almost intoxicating delight to the painter.

The Spongotype

Now it seemed a pity that such rapid artistic work should be limited to one print only, and I started with my assistant, Mr. H. T. Cox, to invent a method for multiplying impressions from the work done on the plate, and he completed the invention.

I have patented the process, merely in order to prevent anyone else from securing a monopoly of its use, but give it freely for all to use and improve upon.

Mix in equal parts graphite with German printing black and oil, and cover the copper plate with this by means of a lithographic roller. Then do your wiping away of the forms as before described.

Take equal parts of bath-stone scraped to powder, bronze powder, and asphaltum (also in powder): soak the two first in turpentine, and when quite dry mix them with the asphaltum, and place the whole in a little bag of fine muslin.

When your drawing is done, dust it over with this mixture through the bag, until the plate is covered. Then brush it off very carefully and gently with a soft camel-hair brush, and you will see your work again, but filled in different degrees with the powder Let this dry for three days, and then send it to an ordinary electrotyper, and tell him to deposit copper upon that surface, but with the strict injunction not to touch the face of the work; for the plate is perfectly ready for him to commence his depositing, the plate having been made into a proper matrix.

When you receive the deposited copper, which will be of the thickness of an ordinary plate for etching or engraving, you will see the reverse of what you did. You lowered the lights by wiping away the ink, and left the ink standing up for the blacks. Here you will see the lights high and the tones lower, in a sort of granulated surface.

This process, which is eminently suited for original work, opens up endless possibilities to the painter, who, in using it,

is hampered with none of the technical difficulties of an engraving process. He can get his result without having in any way departed from the mitier with which he is naturally familiar. And it is conceivable that by working on the electro-typed plate with dry-point and scraper results may be arrived at which will surpass in artistic quality anything that can be obtained by methods of reproduction hitherto practised.”

 

Demythologising electro- etch

“If two plates of copper be connected with the opposite ends of a voltaic battery, in a vesessel containing very dilute sulphuric acid, the plate connected with the copper of the battery will be attacked by the anion oxygen which is released during the decomposition of the acid”.

“By alternately exposing the plates to the action of the decomposing fluid and stopping out parts of the work, the required gradation in tints is obtained.”

Battery 1850

Battery 1850

“Electro-etching has the advantage of being free from the exhalation of any deleterious gas, but the apparatus required involving a battery and an extra copper plate, is more cumbrous, and the process itself more complicated, and does not appear to have been adopted for artistic work to any considerable extent.”

Chattock, R. S. (1883) Practical Notes on Etching. (2nd. edition) London: Sampson Low, Marston, Seale, & Rivington.

Although; the equipment we now have at our disposal is more effective, efficient and certainly can’t be described as cumbrous; the myth of complexity still sticks to electro-etching. Colin Gale and Megan Fishpool offer a key to demythologise the process in their excellent book ‘The Printmakers Bible’. They describe electro-etching as being “A reasonably complicated process and there are very few printmaking workshops with the equipment and ability to host it”. We are currently exploring the possibility of providing the equipment, training, and support fro electro-etching at The Regional Print Centre in Wrexham. If we can make this happen, it will help other artists to explore the mark making potential of electro-etch.

 

Electrotype Manipulation 1852

Describing electro-etching in 1852 “If, for instance, plates of copper be covered on any part of their surface with a stratum of varnish, that part will be excluded from the line of action, while all else is being consumed. Advantage has been taken of this, by coating the plate with proper composition and then tracing through it any design, of which an etching is required. The plate in this condition is submitted to the action of nascent oxygen, and the surface is readily and effectively etched. There is some superiority to  possessed by this method, over the ordinary etching by the use of nitric acid; for the operation can be conducted with considerable regularity; it can be rendered a slow or speedy process; and the results can be taken out from time to time, to be examined, and can be re-submitted in a moment.”

Face plate to Electrotype Manipulation

Face plate 1852