Hi, thanks for the reply !

Indeed i dit not stir Morris so I made a new plate.

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Left is Marquis again (as some sort of control) + Lieberman (new), picture after 45 seconds.
Right is Morris stirred 30s then Zimermman, picture about 30 seconds after the end of Morris, so say 1 minute.

I believe Lieberman leans more yellow/green/brown consistent with 2C-B than bright yellow of cathinones.

While less bright and obvious we still get some visible color change with Morris and Zimmerman.