Shredded mint leaves - created brown juice/liquid

Any idea where a brown liquid/juice would come from when shredding mint leaves? I used a small grater attachment to 'shred' about a quart of mint leaves picked from the garden. washed thoroughly and spun dried. after shredding all the leaves there is a brown liquid in the grater attachment and bowl. just curious and thanks in advance.

submitted by /u/remlluf
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