Preparing And Etching A Copper Plate
This is one of the plates I'm working on at the moment. You may recognise the drawing from my earlier post of bird sketches. I decided I wanted to follow my drawing fairly closely so I photocopied it onto trace paper.
Recently I salvaged a lot of copper from the copper bin, nice big plates of it, already used but I can use the backs of them. BUT it takes a lot of cleaning! I bought an electric sander to get the worst of the marks off. Gradually using finer and finer grade sand paper. I then go onto wet and dry paper and sand by hand.
Finally, after much sanding, I use brasso and crocus powder to polish up the plate surface. The more polished the surface the whiter the background of your print. Any scratches will show up when you come to print so you have to be very careful.
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Now for the hot plate and the ground. Ground is a waxy substance you put on the plate which protects it from the acid. You draw into the ground and where you draw it exposes the copper so when you put it in the acid it eats only where you have made marks in the ground.
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For this plate I have applied soft ground first. It helps me recreate my drawing as you will see, and gives a good variety of line in the final print.
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I don't want to trace all the lines because the soft ground will just be a starter. The main lines will be done in hard ground.
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Plate with applied soft ground
I now place the trace paper carefully on top of the plate and trace some of the lines.
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Also I must mention that the back of the plate is protected with either stop out varnish or sticky back plastic so the acid doesn't eat into the back and exhaust itself.
I then place the plate into the acid bath. The acid is ferric chloride. Soft ground doesn't seem to take as long in the acid bath as hard ground, I left it in for 10 mins max.
A bit of turps on the plate will take off the ground and I can see the soft ground lines etched into the plate.
I then want to apply my hard ground so the plate has to be degreased again and brought over to the hot plate.
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In printmaking there are many ways to do things, this is just one example. It's like my mum always told me about cooking, there are many ways to come to the same result!
Soon I will show a step by step 'how to' about printing from the plate.