Selection of work from VAP Al CuSO4 salt etch workshops

New developments in etching chemistry have made it possible for metal plates to be etched in metal salt solutions rather than acid.The new and safer method, Metal Salt Etching, can and has effectively replaced the traditional acid etching approach in many studios and colleges. The benefits of this new etching methodology over the traditional acid etch approach are compelling, both in terms of safety and in regard to the quality of the bitten work.There are several variants of processes, but all are essentially electro-chemical in nature and share many of their basic chemical properties.


Ivana Lavelle VAP 3 Access Aluminium Copper Sulphate Saline Etch







Maria Clarke VAP 2 Al CuSO4 Hardground Etch


Grainne Stack VAP 2 Al/CuSO4salt etch



Jenny Toner VAP 2 Al CuSO4 Salt etch. Tonal areas etched at 2min intervals.


VAP 2 Workshop Al/CuSO4 salt etch

Aquatint frequently involves the use of step etching. The plate is evenly covered in acrylic dots. The first marks are made with a resist (an oil crayon, for instance) - these will print white. Then the plate is etched, first lightly, for say just 30 seconds, taken out, and more marks applied. Further painting and etching stages will then result in a complex and layered tonal image.
In etching, aquatint is normally used to fill open areas on the plate with durable tones or a black. The Saline Sulfate Etch Copper Sulphate for aluminum is self-aquatinting. During etching a very distinctive and durable surface roughness occurs in the open areas; this crystalline texture can produce a beautiful black on the print all by itself.Thus eliminating the stringent Health and Safety precautions necessary when using the traditional aquatint rosin technique.