Yesterday I did an etching based on a sketch I made of the Cheesegrater and St Katharine Cree.
This is a post-card sized etching on copper plate, printed by the technique called Chine collé. Japanese paper is the coloured background, and is printed and glued to Fabriano Unica, all in one process. It’s a bit tricky, but gives a good result, I think. The Japanese paper takes the ink very well, and provides the coloured background.
The plate is made using a hard-ground etch, then aquatint. Hard-ground etch means I put a varnish on the plate, then draw the picture in the varnish, so revealing lines of bare copper. Then I dip the plate in acid for 20 minutes. The acid attacks the bare copper and makes lines. Then if I print it, it looks like this:
The next stage is aquatint, to make the tones. Aquatint is nothing to do with water, and nothing to do with colour. The name is misleading. The plate goes in a box, where I’ve turned a handle to make clouds of fine rosin. The rosin drops on the plate like rain. Then it’s annealed with a gas burner. Now there are lots of tiny dots in a random pattern on the plate. The skill now is to paint and dip the plate, so as to get the tones. The longer the plate stays in the acid, the blacker the tone. But if you leave it too long the acid bites off all the dots and the tone is light again.
The picture has 5 tones and plate tone. The darkest tone was in the acid for 4 minutes.
Here is the plate being inked up:
I did the printing on the Henderson press at East London Printmakers.
Jane Sketching 