Question mixing Noodlers & Penman Sapphire

Last week Chuck Swisher posted saying that there was a definite problem with
mixing Noodlers Aquamarine Blue Contract Ink with Penman Sapphire Blue.
I admit that I have been mixing a little Sapphire with my Aquamarine to get
a little darker blue in two Pelikans now for a couple months or so without
problem.
If anyone has information as to what to look for ( or expect) in the way of
problems I would like to know.
Thanks, Ken.

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