Public domain
Washing. After certain dilute chemicals have been recovered from the rubber, it is in the form of flocs or crumbs looking like popcorn. It is then washed and excess water is removed
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Credit lineWashing. After certain dilute chemicals have been recovered from the rubber, it is in the form of flocs or crumbs looking like popcorn. It is then washed and excess water is removed. 1935-01-01. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.