On Thu, 27 Aug 1998 17:27:13 +0000 "Peter L. Peres" writes: >I don't know about lasers but there is ink-jet printing equipment used >to >mark products on a conveyor belt. I have encountered these in small >factories here (food industry / canning). This is what puts the >numbers on >food cans, yoghurt etc. > >I can find out who sells them but me not being lost in Vermont, it's >better to look locally. I know that the ink does not come off with >anything and is food-grade. Which makes me wonder what it's made of. Just about every can or bottle has a number on it from one of those printers these days. The ink comes of readily with isopropyl (rubbing) alcohol and possibly other alcohols as well (Do they label liquor bottles with it?). It is likely the same ink that is used in office type ink-jet printers. The machine must not be too expensive but it would only make sense for many thouseands of units. For a few hundred boards, destructible paper labels seem like a good choice, though they would have to be applied after the board was completed. You could spray clear lacquer over them for more durability, though durability is not what you want to discourage tampering. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]