3. HEATING THE ETCH
Before the bottle can be separated, it first must be uniformly heated. Light the candle and slowly rotate the bottle in one direction with the tip of the flame about an eigth of an inch directly under the etch. Usually about three or four revolutions are sufficient.
Then rotate the bottle two or three times at a faster pace to give a final uniform temperature to the glass. The bottle should feel hot to the touch, but not too hot to handle.
4. SEPARATING THE BOTTLE
Place bottle in an upright position and, before te bottle cools, rub an ice cube around the etched line one or more revolutions until the etch becomes a crack. Crack should continue completely around the bottle.
If a slight tug on the two pieces fails to separate them, don’t try to force them apart. Return bottle to the candle flame and reheat the etch as in step 3. During this reheating process, you may hear audible “clicks” indicating that the uncracked portions along the etch are now cracking. After heating again, try to separate the two parts once more. Remember, don’t use undue force, let the glass work itself free! (Sometimes, it’s necessary to repeat the heating and cooling steps several times depending on the thickness of the glass.)