Hello. I no longer own an 850, but... I found it once. It is on a service tag either in the engine compartment or on the door pillar. I believe the color code is the second line, with the VIN being the first line. You can spot it easily by the length, which is three digits, a dash and a two digit extension.

The three digits specify the color; the two extra digits specify the paint manufacturer and paint formulation (I believe).

Thus, the code should look something like "154-04". My car was red pearl, which was 154.

Good luck! Don