There are two kinds of beef tripe, the beef tripe grown up on feed is yellow, and the beef tripe grown up on grain crops is black. The white cowhide is bleached and belongs to frozen food.

Extended data:

Hairy belly is flat and sweet, and belongs to spleen and stomach meridian; It has the function of tonifying deficiency and benefiting spleen and stomach; Deficiency after treatment, deficiency of qi and blood, thirst quenching, dizziness due to wind. Materia Medica for Dietotherapy: it can treat thirst, dizziness, tonify the five internal organs and cook with vinegar. Compendium of Materia Medica: Tonifying the middle energizer, invigorating qi, detoxifying and nourishing the spleen and stomach. "Herbal Mengquan": "Strengthen the spleen and stomach, and avoid food accumulation injury".

References:

Hairy belly? Baidu baike