Rembrandt van Rijn was a Dutch painter and etcher who is widely considered one of the greatest painters in European art history. He is most famous for his use of OIL paints, which is reflected in the two crossword solutions for the term 'Rembrandt's Medium': OILS (4 letters) and OIL (3 letters). Oils are a type of paint made from pigments suspended in a drying OIL, such as linseed OIL. This type of paint has been used by artists since the 15th century and is still popular today.