IPA: /ɪnˌkrʌsˈteɪʃən/
KK: /ɪnˌkrʌsˈteɪʃən/
A layer or coating that forms on a surface, often made of a different material, such as salt or a decorative substance.
The old statue had an incrustation of moss that made it look ancient.
Incrustation → It is formed from "in-" (meaning in or into) and "crustare" (meaning to cover with a crust). The word describes the act of covering something with a crust or layer.
Think of something being 'covered' ('crustare') 'into' ('in-') — that's why incrustation means a layer or covering.