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 stain a capsule of a cell by Manevalâs staining method. 1  1 % Congo red solution. 2  Manevalâs stain. 3  Capsulated cell culture. 4  Take a loopful of capsulated cell suspension on a clean grease free slide.  Add a drop of 1 % congo red solution in the suspension and then spread it gently on the slide to form a smear.