"opalesce" in the verb sense
1. opalesce
reflect light or colors like an opal
"Distant clouds opalesce like pale brocade"
"raindrops caught in a sunbeam seem to opalesce"
2. opalesce
exhibit a play of colors like that of an opal
"This nitrate opalesces under certain conditions"
Source: WordNet® (An amazing lexical database of English)
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