Assertion: fresco | /r/HasProperty | cleaned with wet sponges
Facets:
value: often
type: TEMPORAL
value: historically
type: TEMPORAL
Source sentences:
text: Being a film on the surface of the plaster, however, means that tempera touch-ups are less durable, subject to flaking as their bond weakens, or removal by even light abrasion (historically, frescoes were often “cleaned” with wet sponges, sometimes even varnished to