that non expressive offspring from lipstick parents would throw expressive lipstick babies.
I own two sunglows produced by Barry Berg. They are 04's. There were many of these high red contrasty sunglows in the litter, and also some very bland looking sunglows. I purchased one of the redest sunglows i've ever seen, and one of the bland.

Both have produced for me, and the bland looking sunglow produced bland babies, not one high contrast or red baby.

The high contrast red sunglow produced killer offspring. Some of the reddest albinos and sunglows i've ever seen.

I would argue my line of Red sunglows is a line-bred trait just like the lipsticks.

So, IMO, lipstick offspring that don't show the trait won't throw lipsticks, and shouldn't be deemed as such.
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