Precipitate Colors
Please note: This list is very incomplete, and many of the compounds listed can produce colours very different to those listed.
Au = Orange
Cr = Deep Green / Orange / Purple / Murky Green / Red (When combined with Aluminum in Rubies)/ Yellow / Brown
Co = Pink
Cu = Blue
Fe (2) = Green
Fe(3) = Brown
Mn = Very Pale Pink
Ni = Green
Anything not on this list will (generally) form a white precipitate.
Read more about this topic: Precipitation (chemistry)
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