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.
In a capsule stain, the negative background stain is combined with a positive stain that dyes the cytoplasm of the bacterial cell. This composite stain is useful when you are trying to observe both the cell morphology and the presence of a capsule around the cell.