Where does “Schimmelkäse” come from?

Schimmelkäse (German) comes from German Käse, from Middle High German kæse, from Old High German kāsi, from Proto-West Germanic kāsī, from Proto-Germanic kāsijaz, from Latin cāseus, from Proto-Indo-European kwat- — to ferment, become sour; to boil.

Schimmelkäse (German): cheese with mold; blue cheese, etc

Definitions

cheese with mold; blue cheese, etc

Ancestry of “Schimmelkäse”, step by step

Schimmelkäse traces back through two separate lines of ancestry.

via German Käse

Step	Language	Word	Meaning
1	German	Käse	cheese; nonsense
2	Middle High German	kæse	cheese
3	Old High German	kāsi	cheese
4	Proto-West Germanic	kāsī	cheese
5	Proto-Germanic	kāsijaz	cheese
6	Latin	cāseus	cheese
7	Proto-Indo-European	kwat-	to ferment, become sour; to boil

via German schimmel

Step	Language	Word	Meaning
1	German	schimmel	inflection of schimmeln: ## first-person singular...
2	Middle High German	schimel	—
3	Old High German	skimbal	mould

Every word from Proto-Indo-European kwat- →Every word from Latin cāseus →Every word from Proto-Germanic kāsijaz →