Related Clues:

• 'Essential' things
• Traditional paintings
• Alternative to watercolors
• Many impressionist works
• Monet order?
• Aromatherapist's substances
• Some paintings with lilypads
• Works at a museum
• Palm products
• Reduces friction
• Some MoMA works
• Old masters used them
• Works at a museum?
• Some lipids
• Motor or mineral, for two