Edible anurans have to rely on more than just poison glands which tend to work too late (i.e. after the predator has it in his mouth!) Related articles: How to Rid Your Garden of Toads-tips for dog owners (aside from training the dog of course!)
Manevalâs staining method is a negative staining method. To stain a capsule of a cell by Manevalâs staining method. 1  1 % Congo red solution.  Manevalâs stain.
staining with azure or similar metachromatic thiazine dyes; pertaining to azurophilia. azurophilic granules. the large, homogeneous, dense, peroxidase-positive granules of progranulocytes and early myelocytes that stain blue with Romanowsky stains because of their acid mucopolysaccharide content.