If removal is postmortem, this must be done rapidly so as to avoid deterioration 2.
Fixative solution used is determined by particular tissue and staining method.
Formaldehyde is by far the most common fixative. Paraffin hardens as it cools - forms block. These slices are used in preparation of microscope slides, after staining and mounting. Slice mounted and passed through xylol, toluol or xylene to remove paraffin. Most sections are stained with both acidic and basic dyes to enhance contrast by providing different colors.