Chinaware is made from literally dirt so it’s cheap and did not degrade as quickly as other materials. It also holds it’s shape as opposed to most metals and plastics which is important to the physics involved syphonic flushing, and once glazed has antimicrobial properties and is easier to clean, and inhibits mass evacuation from the bowl.
I worked in sales analysis for a toilet company and we charge more for colors since there is a higher reject rate on the lines and you have to tint, so the market sticks with white.
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