On 15/04/2010 22:10, James wrote:
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> You don't even need transparencies. I've used ordinary laser printer paper, a friend of mine has better results using tracing paper and laser printing on that. You have to make sure you print it so the toner side is against the board when you expose, and weight a piece of glass over it to hold the pattern completely flat against the board. Once you figure out the correct exposure time it can produce very consistent results.
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> Bubble tank is easy, I built one out of acrylic but I've seen people use those narrow rectangular food storage containers with an aquarium air pump and heater. The heat is the most important part.
When I used a laser printer for transparencies I got good results with
tracing paper. I have heard of people putting cooking oil onto artwork
printed on ordinary paper, to make it translucent. I tried it once, and
it worked, but it was a bit messy.
Leon
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Leon Heller
G1HSM