Liquid creamers are oil-in-water emulsions. Over time, these emulsions can break down, leading to a "mature" appearance where the liquid looks unappetizingly mixed with visible fats or sugars. Signs of Over-Mature or Spoiled Creamer
If a creamer is too "mature" (spoiled), it will exhibit clear warning signs: mature wet creamers
While not a technical grade, "mature" often describes liquid creamers that have been opened for an extended period or are past their peak freshness. Liquid creamers are oil-in-water emulsions