Tartrazine is often used as a saturated solution in cellosolve (2-ethoxy ethanol) as the displacement dye to replace other (red) acid dyes while the tissue from which the other dye has been removed is stained yellow. Lendrum's phloxine tartrazine method for Paneth cell granules is a good example. It is rarely employed for other purposes, although it contrasts very well as a background stain with nuclei stained by nuclear fast red.