Fill in prepositions where necessary: 1. Occasionally a drug must be mixed...a harder substance.
2. Eluctriation consists...diffusing an insoluble powder...water.
3. Maceration...a higher temperature is called digestion.
4. Defatting means removal...fats.
5. The extraction...active principles...drugs...boiling water...prescribed time is decoction.
6. Strainig...muslin we call rough filtration.
7. All the proccess are employed...a prescribed time.
8. A sediment usually collects...the bottom...the vessel.
9. Sometimes it is necessary...separate fluids...different boiling points.
10. We remove color...substances...means...various bleaching or absorbing agents.

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