This category corresponds to the class No type definition was found for "EN48.Preparation_Layers" in the ngex import. of the NG CIDOC Extentions to the CIDOC CRM vocabulary, (see MediaWiki:Smw import ngex).
"""Specific sub-class of E18 Physical Thing, a class used to group a range of materials which represent the preparation layers applied to the primary support of a work of art prior to the application of any paint.
- A the canvas support [E13] of the painting [E84] was covered in a layer of gesso [EN48]"""
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