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What is the difference between hard and soft paraffin wax?

Two type of paraffin, differ in the fusion point, the soft paraffin has a low fusion point so it is soft in room temperatures, it is used in impregnation. The hard paraffin has a higher point and is harder in room temperature. It is used in embedding.

What is the meaning of "electronlucent"?

Electronlucent: allow the passage of electron beams, appear light, the opposite of dark electron dense.

What is the difference between vital and supravital staining?

Both are staining of the living tissue or cell. The vital staining inside the living body, supravital staining outside the body.