1. weighing one gram, weighed, crushed and sifted through 80-mesh sieve into moisture can pass the drying temperature of 135 ° C for 2 hours, then cooled in desicator then record the exact weight of moisture can.
2. Bake in a hot air oven to a temperature of 135 ° C for about 2-3 hours until constant weight
3. Leave to cool in desicator then weighing them.
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