Marking out solution

I couldn't easily get hold of marking blue, but discovered a recipe in
SParey for an acidulated copper suplhate solution which works quite well.
The recipe is really easy - a couple of teaspoons of copper sulphate in a
medicine bottle of water and make acid with a few drops of sulphuric acid.
THe metal has to be oil free or it doesn't work. On clean steel you get a
very durable copper finish, which has a second advantage of keeping out the
corrosion in damp workshops...
Reply to
Loading thread data ...
sulphuric acid.
Our 'Pound Shop" here in Bromley occassionally has broad tipped felt tipped marker pens with spirit ink, and I find them excellent as marking out backgrounds prior to scribing - I try to keep to blue but other dark colours also work well !
I have a bottle of 'proper' blue but the pens are so much more convenient.
Reply to
Andrew Mawson
Just make sure it is a saturated solution.
Reply to
Neil Ellwood
Its saturated allright - you should see how much water he puts in it... ;-)
Regards, Tony
Reply to
Tony Jeffree
I use those big fat Eddings 200 or 2000 marker pens, handy quick to apply and not as messy as marking blue
-- Regards,
John Stevenson Nottingham, England.
Visit the new Model Engineering adverts page at:-
formatting link
Reply to
John Stevenson
very interesting , i always thought it was done by using electrical current.. tell us more .. where you get the sulphuric acid from?? what u using? how much sulphuric do you have to add???
Reply to
steves-place www.bigun.serverb

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.