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The 'type' or 'pattern' of desired chip design is dependent upon the glue to
water ratio.  Generally the dry glue is combined with COLD water in a ratio
of 2 parts water, 1 part glue. This is measured by WEIGHT - 1 oz. of glue to
2 oz. of COLD water per sq. ft. of glass. If your glass is 24"x24", this is 4
sq. ft, you will need 6 oz. of DRY glue and 12 oz. of cold water.

Using metric measurements is easier when combining wet and dry materials by weight. 1 litre of water is 1 kg.  So for 0.1 sq. metre (approximately 1 sq. foot) of glass you need 28 grams of glue to 85 cl of water. After mixing let this mixture stand for about 1 hour to absorb all the liquid. It also helps to cover this container to reduce evaporation. This mixture will form a gelatinous mass.

Average Recipe:
1 to 2 ounces of Dry Glue per sq. ft. 
3 ounces of COLD water per sq. ft. 
285 to 570 grams of dry glue per square metre
850 centilitres of Cold water per square metre (One square foot is about 1/10 of a square metre)

Heat this mixture in the double boiler.  Do not try to heat the glue container directly on a burner. This will stink tremendously. Slowly heat this mixture to 60 – 65C (140 - 150 F). It is important that you do not boil this mixture and that is stays between these temperatures. Use a sugar/candy thermometer to measure the temperature of glue. Stir occasionally. Heat slowly.


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   glue chipping - part 3
   mixing the glue