EV 1537

Enigmatic Variations 1537

Additive by Kcit

+ – + – + – + – + – + – + – + – + – +

SODIUM CITRATE (chemical formula Na₃C₆H₅O₇) appropriately MAKES CHEESE INTO NACHO SAUCE (extra wordplay letters).

A full review of this puzzle can be seen over on fifteensquared.