3/44 Winchester

[vintage hunter]

Some if not all formulations of cold blue also emit a very distinct odor for a good while after application. Rub the suspected area fairly hard and fast with your finger tip until you feel heat being generated and give the part a sniff. The odor is had to describe but to me it has a sort of irony, mildly acidic, skunky aroma, like someone mixed hydrochloric acid with skunk pi$$ then poured it on a brillo pad.