This test enables you to judge if your stock contains enough pectin to achieve a set. Put 1 tsp of stock in a small container. When cold and 1 tablespoon of denatured alcohol, swirl together, leave for 1 minute and check for a set:
High Pectin: the mixture formes a jelly-like clot.
Medium Pectin: 2-3 soft clots form. The stock may or may not set satisfactorily, return to the heat to reduce a little further and test again.
Low Pectin: Numerous small globules form. Return to the heat and reduce the volume of the stock and test again.
NOTE: discard the tested stock- denatured alcohol is poisionous.