Test for pectin...exciting
You can test how strong the pectin content is by putting a teaspoon of juice into bowl and mixing in two tablespoons of methylated spirits.
If the pectin content is low, small separate lumps will form. Juice high in pectin will form one large mass.
Discard the mixture from the bowl...don’t attempt to eat it.
If the set is not strong, continue to reduce the liquid and test again.
Filter through muslin before bottling.
Pour into sterilised bottle and seal or freeze in ice block trays
Rule of thumb, according to the book, is 150ml of pectin to 1.25 litres of fruit juice for making jelly. It should be enough for 2kg of soft fruit when making jam.
Quince pectin has the lovely red colour of cooked quince and a distinctive flavour. It is particularly good with berries, pears and apples.