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What is Gravelox ( Gravalox? ) colouring solution for metal.
I am looking for information on a chemical colouring solution called Gravelox (or Gravalox) which can be used to improve the contrast of marks made on metal. I don't know whether it's an oxidation or dye deposition process. We want to improve the contrast of laser generated marks on galvanised steel.
National Centre for Laser Applications - Galway, Ireland
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