the influence on the area and numerical density of nuclei was investigated in 5-mm-thick slices of guinea pig liver for different fixatives and variations in tissue processing : delay in fixation , air drying , degree of acidity of 10 % formalin ( = 4 % formaldehyde ) , bouin and mercury-formalin fixatives , acetone and ethanol dehydration and understretching and overstretching of the paraffin-embedded sections .
C0016564
formaldehyde
C0949307
formalin