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.
To visualize bacteria, either dyes or stains, or an alternative source of illumination (phase contrast or differential interferrence constrast) are used. Since staining of bacterial cells is relatively fast, inexpensive, and simple, it is the most commonly used technique to visualize bacterial cells.