Patent ID: 7169471

Claim:
A laser marking additive, comprising: a plurality of particles having a thickness less than 100 nm and all dimensions less than 25 microns of at least one compound of the formula: MOCl where M is, independently, As, Sb, or Bi; or a compound of formula BiONO 3 , Bi 2 O 2 CO 3 , BiOOH, BiOF, BiOBr, 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 ; wherein a lacquer drawdown comprising the additive has a luster index of greater than 50%.