1 tsp of glue : 3 drops of food colouring : 1.5 tsp of water. The more food colouring the darker the jar will be. In order to make a turquoise shade you will need two drops of blue and 1 drop of green.
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Keep the glass wet when drilling – it prevents the glass from overheating and breaking. A squirt bottle of water close by should do the trick and keep the hole wet as you’re drilling – it also keeps the glass dust down (see next tip). Wear a dust mask when drilling – that smoke isn’t smoke, but glass dust, which is carcinogenic.