HYB: ? pigments - blends vs mixing

Neil, Chuck, anybody who has time, energy, and knowledge -

I've been looking at photos and thinking about what I see in seedlings
and would love some help in understanding why some crosses produce
blends and others produce smooth mixes of colors.

By blend, I mean two or more colors on a petal that can be seen as
separate colors up close (i.e., parts of the petal are blue, parts of
the petal are yellow) and the colors are streaked or fade in and out
from one color to the other.

=== I guess my first question is whether or not that is what most
hybridizers mean by 'blend'.

By a smooth mix of colors, I mean two pigments are present but the
result is that the petal is a third color (i.e., both yellow and blue
pigments are  present, but the petal looks "red" or brown).

=== Are different pigments present in blends than are present in smooth
colors?

=== If the same pigments are involved in both blends and smooth colors,
as a pollen dauber, what do I need to know to get one vs the other?

In particular, I'm thinking about reds, "caramel" brown/tan, and orange.

I think Chuck explained oranges.  Two different pigments have to be
present - pink and  yellow.

Seems like there are orange blends (various shades of yellow orange to
pink orange) - are the same pigments involved?

--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

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