crusting
crust-ing
verb
Forming or causing something to form a hard outer layer.
"The mud was crusting quickly in the sun."
noun
The process of forming a hard, dry outer layer or crust.
"The wound's crusting indicated healing."
Thesaurus
Synonyms: crust, Earth's crust, encrustation, incrustation, insolence, impertinence, impudence, gall, freshness, cheekiness