Crumbling Material Behind The Caulk Seam In The Tub? - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum

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Old 03-02-2015, 12:48 PM   #1
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Crumbling material behind the caulk seam in the tub?

I own a condo I bought a year ago. The condo building was built in the 1940s and the tub is the original. Today, I removed some caulk in my tub in order to re-caulk it. There is some crumbling material (brown dirt-sized particles) that is behind the caulk in the seam. I vacuumed it up and the particles are gone now.

Is that a sign of water damage done to the walls behind the shower?

Should I just re-caulk it and forget it? Or is it a sign of mold?
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