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Which edding can you recommend for drawing on circuit boards, i.e. on copper? It should have a line width of 1mm/2mm and be resistant to iron III chloride as an etching agent. Can I place a Toniebox or Tonies on a surface designed with edding 5200 Permanent Spray? I would like to permanently label 3D prints. Which pens are suitable for labelling the plastic so that it remains abrasion-resistant? Why are the colors more intense/less intense than shown on the packaging?