Thread: Salm Coticule question

Recently someone posted that the brown splotches/lines/inclusions in a Salm Coti might be magnesium. Can anyone enlighten us regarding these brown spots?

I have a particular progression that includes a Salm Coticule and works very well. I am getting great edges from this progression and I would like to know what that brown stuff really consists of.

Please share any knowledge you have and thank you in advance. Inquiring minds want to know......

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Jerry