This casting was identified while it was hot ( just molded) at approximately 510 deg C  .
 

The Sequence Prior to Taking the Picture:

1. Laser darkenable coating applied at 510 deg. C.
2. Laser marked using a 25 W CO₂ Laser ( approx 8 sec).
3. Water quenched (flow directly on the mark) to ambient temperature ( 5 sec).
4. Reheated in a furnace to 510 deg. C ( no flame impingement on the mark).
5. Maintained at 510 deg. C for 16 hours.
6. Water quenched (flow directly on the mark) to ambient temperature ( 5 sec).