noun
painting knife
A thin, flexible knife used in oil painting to apply or mix paint directly on the canvas, distinct from a palette knife.
油絵を描くとき、ペインティングナイフで絵の具をのばす。
When painting an oil painting, I spread the paint with a painting knife.
Variant with a middle dot, sometimes used for clarity.
A palette knife is primarily for mixing paint on a palette, while a painting knife is used directly on the canvas for painting effects.
Loanword from English 'painting knife'.