A pH-indicating material capable of undergoing a clearly visually detectable color transition at a desired pH, e.g., at a pH at or below about 5.6 and/or at a pH at or above about 7.6. When the pH-indicating material is wetted on its surface with liquid animal dross, particularly animal urine, such as cat urine, the pH-indicating material will undergo a clearly visible color transition at a urine-problematic pH, e.g., acidic or alkaline. The pH-indicating material is maintained on an inert carrier, separate from the cat litter material itself, so that the cat litter material does not chemically interfere with the urine pH-induced color transition provided by the dye(s) in the coating material, and so that the color transition is an exclusive result of the pH of the contacting animal urine, without pH interference from the litter material. In a preferred embodiment, the pH-indicating material is admixed with any cat litter material and has dual indicators that provide one color transition at a low pH and a different color transition at a high pH so that acidic or alkaline animal urine problems can be visibly detected upon contact between the animal urine and the pH-indicating material.
一种 pH 值指示材料,能够在所需的 pH 值(例如,pH 值为 5.6 或低于 5.6 和/或 pH 值为 7.6 或高于 7.6)下发生清晰可见的颜色转变。当 pH 值指示材料的表面被液态动物粪便,特别是动物尿液(如猫尿)浸湿时,pH 值指示材料将在尿液问题的 pH 值(如酸性或碱性)下发生清晰可见的颜色转变。pH 指示材料保存在惰性载体上,与猫砂材料本身分开,这样猫砂材料就不会对涂层材料中的
染料所提供的由尿液 pH 值引起的颜色转换产生
化学干扰,从而使颜色转换完全由接触的动物尿液的 pH 值决定,而不受猫砂材料 pH 值的干扰。在一个优选的实施方案中,pH 值指示材料与任何猫砂材料混合,并具有双指示剂,在低 pH 值时提供一种颜色转换,在高 pH 值时提供另一种颜色转换,这样,当动物尿液与 pH 值指示材料接触时,酸性或碱性动物尿液问题就能被明显检测出来。