Porosity in Thin Section

	Pore viewed in plain light. Note the two sphere like air bubbles within the pore. These formed during the thin sectioning process and can be of some use in identifying a pore. Otherwise they are not very desirable.
	Pores view under cross polarizers appear black. This is a better way to look for pores  than plane light but opaque items also appear black as well as isotropic minerals like fluorite.
	Pores viewed under crossed polarizers and with the 1st Order Red accessory plate inserted into the microscope. This is an easier texture for your eye to recognize than black is but still makes differentiation form isotropic minerals problematic.
	Pores impregnated with blue dyed epoxy and viewed under plain light. This is the best way to observe pores in thin section. The only significant problem is that the shade of blue is similar to that of a stain that is frequently used to identify certain types of carbonate minerals.