On 09 Aug 2005 23:33:45 GMT, "Genome"
wrote:

i need some help with new system my company is developing for purpose of
marking rare
coins with security code system uses precision laser to melt surface making
low
contrast 1 mm by 0.1 mm barcodes that is essentially invisible to observer
unless coin
catches light just right you can see system at http://shin-ra.com/index_senjutsu_rokko.html


Just a thought. The rim of the coins are often already ribbed. Is
it possible to use these ribs to embed the barcode? Run a stylus or
laser beam over the ribs and a barcode sequence can be read.