We operate out of an old depot and also experience this white
crumbly "effervescent" material on our brick walls. Though it may be
removed for cosmetic value I am fairly certain it is not cause for concern
with your artifacts unless they came into direct contact with it.  I do
recommend that if you are planning on removing it that you at least cover
artifacts in some way and be sure to vacuum well after the job is done.

Milissa Brooks-Ojibway, Registrar
St. Louis County Historical Society
Duluth, MN
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