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What are the main reasons for using oils on top of undercolors (in enamel or acrylics)?

Discussion in 'Oils' started by Lucas Ferron, Jul 22, 2021.

  1. Lucas Ferron Active Member

    I have recently purchased my first oil paints and decided to try them a bit:

    I started by mixing a half-assed purple tone to paint over a vivid burnt-sienna undertone:

    I liked the process itself and decided to move on and mix some human skin tones and paint on top of some blocky sketches:

    I really like how easy blending becomes with oils, but I have a question:
    I've been told that oils can be a bit transparent, so it's a good idea to paint them over established undercoats to make the whole process easier.
    Is this (oils potential transparency) the only reason to use undercoats?
    If I have the correct range of values, but with wild chroma ranges, would the process work in the same way?
    For example, what if I tried applying realistic skin tones on top of this sketch, would that work?:

    Or would the chroma be an issue?


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