What is the best way to achieve an even, matt black finish on flat
sheet silver? I have tried liver of sulphur, but get an uneven,
patchy finish every time. Sometimes the black even goes green in a
type of patina finish - what am I doing wrong?
First of all be sure that your piece is absolutely clean. Even the
smallest amount of finger grease or similar will affect the outcome.
Next go very slow with the process, i.e. use a cold solution on a
cold workpiece and a very dilute solution. Dip your workpiece for a
minute or so, take it up and rinse it under running water, scratch
brush it with a brass brush, dip, rinse and brush again and again
till you have reached the colour you want. This process works for me,
either with liver of sulphur or a commercial product named "oxylen
oxyd" which I suspect contains selenium sulphide.
Hope this works and let us hear your results. Happy dipping.
Contemporary and Viking Age Jewellery
Classes in Jewellery Techniques