Answer:
What the artist used to create the artwork.
Explanation:
Examples of this are things such a colored graphite , charcoal , acrylic paint, etc. It could even be odd things such as coffee. It's just whatever substance is used to make a piece.
As someone who actually hasn't tried fruity pebbles before,
Cheerios.
raw image format or .dng
hope this helps
the neuters, the puritanical
OMG HELLO BESTIE