Orchiata is composted in huge windrows, as a way to break down the pine resins that would be toxic to your orchids. (Rexius fir bark is steamed to do that, but it also softens it, reducng it's life span.)
During that process, the pH is monitored and adjusted by the addition of dolomite solutions. Some of the solution is absorbed, and some will remain as a dust coating.
A quick rinse will take away some of the coating, but will not have a significant negative impact on the absorbed stuff. Just don't soak it overnight, as is often recommended for bark.
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