Answer: oils

AnswerCrossword Clue
OILSWorks at a museum
OILSSome palette colors
OILSSome paintings
OILS"Mona Lisa" and "Girl With a Pearl Earring," e.g.
OILSArtist's choices
OILSLubricates
OILSArtist's medium
OILSMonet works
OILSMakes quieter, in a way
OILSMuseum works
OILSSome Met works
OILSCanvas colors?
OILSMasseur's stock
OILSSome gallery hangings
OILSCooking aids
OILSMasseur's supply
OILSSome Van Gogh works
OILSWorks at the Louvre
OILSCook's array
OILSMakes less squeaky, perhaps
oilsto smear or supply with oil
OILSVan Eyck's medium
OILSMonet's output
OILSSquelches a squeak
OILSGreases
OILSLiquid squirts?
OILSMonet medium
OILSOlive and corn
OILSButter alternatives
OILSMakes slick
OILSPortrait medium
OILSMakes slippery
OILSGives a lube job
OILSMany old masters
OILSMany Rembrandts
OILSOld masters, often
OILSStudio supplies
OILSArt collection, maybe
OILSAromatherapy supplies
OILSMasseuse's assortment