After printing my first stone, my next task was to re-work the image. This means that once a stone has been drawn on, processed and proofed, you can go back to it and make amendments by adding to or deleting the drawing.
Some amendments can be done during the proofing stage, and the stone can continue to be printed straight afterwards. However with others the stone will need to be gummed up afterwards and left overnight before proofing again. This all depends on whether the method you use is abrasive or not.
Non-abrasives: The stone can be printed straight away after using these techniques.
– Etching the image back. This has the effect of increasing the contrast in an image, getting rid of the lighter tones and tending to leave the darker tones. Using a strong-ish gum etch, (a few drops of concentrated nitric acid in gum arabic), paint the etch onto the areas of the image you wish to alter. If you don’t want to have a harsh line where you paint the etch, apply plain gum first and them work into it with the strong etch.
– Soap Wash. This method creates painterly marks which will print very dark with a slightly grainy effect, almost like an aquatint. Using a bar of ordinary household soap and some water, paint the soap onto the stone using a paintbrush. Use as little water as possible and dry thoroughly with a hairdryer, before quickly damping the area with a sponge and rock first of all with a non-drying black nap roller. The rocking ensures that the soap is not picked up and transferred to other areas of the stone. Keep rolling until the painted area is fully visible. This technique, as I have found out, takes a fair bit of practice to avoid the soap wash migrating and smearing everywhere when it is damped and rolled. If the area is too dark, a strong etch can be used to lighten it. Or, if a soap wash is used over an area of existing drawing, it can then be etched back to reveal areas of the original drawing underneath.
Abrasives: The stone will need to be gummed and left overnight after using these techniques, as areas of un-processed stone have been revealed.
– Scraping back the image. This deletes areas of drawing. Using the side of a scalpel blade, scrape away parts of the image. It may be necessary to scrape quite hard and create some dust!
– Pumice powder. This has the effect of lightening areas of drawing. Damp a nylon kitchen sponge scourer, dip into the pumice powder and scrub the areas to be lightened. The ink will be scrubbed off first, so keep going a little bit further after that.