This is a black self with the excess white:
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Here's a sibling with better color. While the color does get lighter as it goes down the hairshaft, it still is gray, not white:
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The goal is as much uniformity in color as possible. There are
umbrous modifiers that intensify the depth of color, although I know little about them. Apparently, they come in positive and negative, multiple positives tend toward deeper color, multiple negatives toward pastel shades. This isn't dilute, the face colors are unchanged, just the main fiber hairshaft is affected. I used to have great depth, the gray fiber from my blues when spun was darker than many herd's blacks. Then I met someone with the palest of pastel shades, and fell in love with those delicate shades. It was different and gave me a greater range of yarn colors. But, it wasn't long before I had totally lost the deep, rich color in my kits, and had the washed-out colors entrenched in my genetics. That was decades ago, and I'm trying to breed back for depth of color. But lately, I've been encountering this white base color wandering high up the hairshaft, a different problem. Very frustrating.
This is apparently different from another type of snowball that is found in some dilute kits, where the color is restricted to the outer 1/8 to 1/4" of fur, but it is only in the newborn kit, when they molt they have a normal coat. I've not seen this type of snowball personally, and I don't believe the cause is known.
The excess white I'm dealing with is obviously genetic, I've traced it back four generations in the herd I bought a red buck from, which is why I suspect there may be something related to the
ee fawn non-extension gene. The fawn genetics do have the white base color, and something must be moving the white base color up the hairshaft. Steel moves the dark base color up the hairshaft, leaving the middle fawn band on the tips. But this is leaving the normal tip color at the tip, so it isn't related to that.