The interiors of these bowls were all white. It was the outside that came in opal blue, red, green and yellow. One vintage ad from 1955 promotes this Pyrex Ware Color Bowl Set as the perfect gift ...

Vintage kitchenware ... found a pine tree-patterned Pyrex test piece that sold online for more than $6,000. Bazzo said that a set of four nesting mixing bowls in a primary color would have ...