brass etching technique

RSFC · Joined: Sep 02, 2010 Posts: 63 Location: space lab

You have to make it yourself. The recipe I used is 75g copper sulphate + 75g table salt to a litre of water. You know where to get table salt. There is a product at hardware stores (i.e. lowes, home depot) in the plumbing section called "Root Kill", that is basically industrial grade copper sulphate (99% pure). Follow safet precautions for copper sulphate and common sense.

If you google the words "copper sulphate saline etch" you will find lots of information. I found 2 recipes, the other just increases the amounts to 100g per litre but 75g seems to be the most common and worked fine for me. maybe 100g speeds up the process but it wasn't that slow. Maybe 20 minutes or so and if you have a decent sized tub you can do multiple panels at once.

Photon · Posted: Sun Dec 12, 2010 4:38 pm Post subject:

Can the solution be reused or is it a one shot?

Either way its an awesome technique. I'm going to give it try soon.
Thanks for sharing.

RSFC · Joined: Sep 02, 2010 Posts: 63 Location: space lab

It can be reused but it has to settle so all the contaminates sink to the bottom. Then just pour in the good, blue liquid. It takes a few days to settle in my experience.

diablojoy · Posted: Mon Dec 13, 2010 1:20 am Post subject:

have been following this
sounds very good Smile

I have a good supply of pnp blue
so will have to try this out soon
one question how are people producing a negative image
so the letters and numbers are etched in
can it be done in FPD ? or do i need to go to another program
i always seem to run into problems with scaling images when i do try
other programs Embarassed