discoloration could be anything recently had separate black brick veneer with black mortar & natural austin stone veneer with white mortar gigs that browning-yellowing all of a sudden appeared post-construction at isolated hi-mid-low areas of brick, stone, mortar materials no moisture intrusion bleed & not a thing w/vb, sheathing or from the required 1 1/2" void was found after invassive-destructive testing, bricks & stones were removed the culprit was determined to be the "slag-slop" mortar cleaning products used by the masons they're removing all affected materials...
source https://www.inspectorsjournal.com/topic/18961-split-face-block-veneer/?do=findComment&comment=173106
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