Testing for nickel

I was wondering if anyone can help me. I work in sub-contract heat treatment
in the UK. At work we have two small bottles labelled "Solution A" and
"Solution B". Solution A is clear liquid and Solution B is a light brown
coloured liquid. If we have a problem heat treating a customers steel this
is one of the tests we carry out. We do this by putting a drop of Solution
A, with a pippette, on to a polished surface of the sample. When a suitable
amount of time has passed a peice of filter paper is used to soak up the
reacted solution and a drop of Solution B is applied to paper and if nickel
is present it will turn red. I am sure I was once told the names of the
chemicals involved but this was by someone that left the company years ago
and I have since forgotten. If someone can help with the names I would
greatly appreciate it.
Best regards
Ian Humphrey