Etching a whiskey decanter

I am having a hard lasering a whiskey decanter, i used paint and moley and still is not a good etch. 50 speed at 70 power. Can anyone help me.

Forgot to mention 50watt co2

I think your power is too high, not sure what 50 means as in mm/s or inches/s, if inches maybe too fast. Try a damp paper towel on-top of the glass for the laser to burn through, seen videos of this being done with co2s. You have to find that speed /power balance.