Exactly what type of jaundice are we talking about… rats pee anywhere from clear to brown, give me html hex values at least or else a proper css or Python color name. Otherwise I suspect the whole term was conjured up by mud slingers and by mud I mean those old bricks made of wet clay soil mixed with straw, 
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Image: Peralta Mud-Hut®️™️ via NPS/CSC.