Laboratory animals are animals raised in captivity for the primary purpose of scientific research, including bioassay, disease diagnosis, biological products and teaching. Such as mice, rats, rabbits and some dogs, sheep, pigs, fish, birds, frogs and so on. Experimental animals play an extremely important role in clinical research.

The marking of experimental animals after grouping is important in the preparation of experiments. In order to distinguish and observe each animal, it must be marked and numbered, according to the type of animal, the number and the length of the experiment time to choose the appropriate marking method, marking method should ensure that the number is clear, durable, simple, easy to recognize and applicable. The commonly used marking methods include dyeing method, tagging method, cutting hole method of ear rim, branding method, cage number and morphological characteristic marking method. Among them, dyeing method is the most commonly used and easy to operate. Dyeing is the use of dye in the obvious parts of the animal body such as coat, limbs, etc., or with different colors to distinguish. This method is commonly used in mouse and rat models.

Colors commonly used to mark animals are yellow, red, black, brown, and purple. The reagent is intended for scientific research purposes only and should not be used for clinical diagnosis or other purposes.