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Uncontrolled variations in flash gold plating colour

I have a problem: flash colour is changing in every strike gold deposit on nickel plated copper jewellery articles.
I am following plating chemical instructions in bath, but in some articles flash colour in not the same at same voltage and temp. and also with same time?
I use progressive D-salt at 45 grm/lt.
what can I do, please tell me? (my English is not good so please ignore mistakes)

Abhishek Agrawal
- Khirkiya M.P., India
November 7, 2010

Then, the nickel plate is not uniform, or the parent metal is not the exact same surface finish, or you agitation is different or a number of other factors .

James Watts
- Navarre, Florida
November 9, 2010

I had that problem at one time. Lighter shade of gold/darker shade of gold/ pinkish all in the same barrel. How old is your strike bath? I've found that, although painful, a new gold strike bath gives excellent color uniformity. As the bath ages, the strike bath progressively gets contaminated from the nickel drag in and other contaminants.

SK Cheah
- Penang, Malaysia
November 11, 2010

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