Boric acid similar boron nitride and soluble hexagonal crystals (methylene blue application).
Boric acid crystals
Light microscopy
Method
1- Crystalline boric acid on glass
2- Instillation of methylene blue (concentrated methylene blue solution)
3- Heating and evaporation (50-60 degrees C )
4- Crystallization and light microscopy observation of microns in size.
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