Mold?

[iceracer]

I have a home built in 1925 that has a poured concrete foundation.

At some point in the past, someone put thin concrete decorative stones on the interior walls.

I get these white spots in areas on the walls inside and I'd like to know how to tell whether or not it is mold?

Thanks, Terry

[clawfirst]

Its probably salt. Pictures?

[dhamblet]

Likely it is efflourescence, salts leaching out from the mortar.