Respuesta :
Priming a support means the adding of the Size and ground layers to it.
What is priming?
When trying to create a support, priming is usually the addition of gesso to a layer at the surface.
This is really helpful in getting a work to stand out. Priming provides a smoother surface for work to go on.
In conclusion, the addition of size and ground is an indication of priming a support.
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