@Michael - You got it right!

@Alan - Interesting experiment. Where did you find sodium ascorbate? I couldn't find a source for it here in the states. Anyway, if you still have those fluids, it would be interesting to add some sodium sulfite to the ascorbate and phenidone solutions to see if the colour clears. I'll predict that (1) phenidone's colour will clear because the sulfite should restore the phenidone, and that (2) the orange ascorbate will not clear. The conclusion would be the same as your conclusion: The orange is due to oxidized ascorbate.

Mark Overton