Duocolor

If daylight is present, the resulting pictures may show a duocolor effect—the highlights and middle tones will be correctly rendered but the shadows may reflect the daylight and photograph quite blue.

A duocolor scheme, a combination of wine and light tan, is used as a decorative effect.

[…] correct a lack of color contrast balance in a slide or print material, to lighten the shadow areas of a print, or to obtain duocolor or monochrome effects.

Oh come on! Saying you can't make a tricolor deck without multilands was bad enough, but now you're saying you can't even make a reliable duocolor deck? _Just how bad are you_ at deck construction?

Use GIF format for any duocolor image (such as black and white or yellow and red).

With the duocolor job, white at the scalp and fuchsia at the nape, she looks like a grumpy powder puff.