Patent ID: 8530785

Claim:
A method of laser-marking comprising exposing a precursor, wherein the precursor comprises a polymer or plastic loaded with a laser-marking additive in an amount of greater than about 1 wt. %, wherein the additive comprises at least one compound of the following formula: MOCl where M is, independently, As, Sb, or Bi; or a compound of the formula BiONO 3 , Bi 2 O 2 CO 3 , BiOOH, BiOF, BiOBr, Bi 2 O 3 , BiOC 3 H 5 O 7 , Bi(C 7 H 5 O 2 ) 3 , BiPO 4 , Bi 2 (SO 4 ) 3 , Pb(OH) 2 .2PbCO 3 , or Pb(OH) 2 .PbCO 3 ; to a laser creating a mark wherein a lacquer drawdown comprising the additive has a luster index of less than 50%, and wherein the additive has a loading weight of 10 to 40% by weight.