Discoloration on substrate

Question- I am getting a discoloration on my substrate after I apply and laser mark the TherMark laser marking materials. What could be wrong?

Answer- This type of discoloration can appear on silver-plated, gold-plated and chrome substrates and mostly occurs when using liquid CerMark materials straight out of the container. The liquid marking materials contain a strong concentrate of chemicals and may cause discoloration when left to sit on some surfaces (especially more inexpensive items). You can fix this problem by adding a small amount of thinning agent (denatured alcohol or demineralized water) to your CerMark marking materials, quick drying the piece with a heat gun, hair dryer or fan after application, and then laser marking and removing the excess marking material quickly. By not letting the marking material sit on the plated/chrome substrate you will greatly decrease the chance of discoloration.