Jeff,

"Simple really. Alkaline batteries leave what looks like white fuzzy
crystals. Some times with bluish green tint.

Zinc Carbon batteries leave what looks like rusty brown sludge. That is
also spread about more and not confined to just the terminals."

Thanks for the clarification.

closer to 2nd Zinc Carbon

Any way it can attach a color photo? If yes please tell max size (will try to keep as small as possible).