Why the viscosity of spicule cream changed?
Why the viscosity of spicule cream changed? Author: SHINEMIIN Q: How to solve it? A: Do not use the spicule purified by strong alkali and acid Why? Because the hydrochloric acid or NaOH are used during purification process , due to the porous and hollow structure of spicule, these harmful solvent cannot be completely removed. […]
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