Picro-Sirius Red Stain Kit (For Cardiac Muscle)The Picro Sirius Red Stain Kit (For Cardiac Muscle) is intended for use in the histological visualization of thin septa and collagen fibers. This modification of the Picro Sirius Red stain eliminates the yellow cytoplasmic staining that can obscure thin collagenous septa. Using this procedure easily allows viewing of collagenous septa as thin as 0. 2 0. 5 microns. The SRC stain may be viewed using standard light microscopy or polarized light resulting