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I wrote up some articles on Appaloosa Genetics just for questions like this! You can see all of them here https://wiki.huntandjump.com/books/all-about-appaloosas-wip

HOM Patn1 will spread your spotted blanket more.

Adding LP Promoter LPP1 or LPP1/LPP1 will extend the blanket to a near-leopard without changing the size of the spots.

LP Promoter LPP1 can only be seen in the GMT lab.

LP Promoter LPP2 also extends the blanket, but makes your spots much smaller (Micro dots).

Adding ASR1 or ASR1/ASR1 will make your spot size larger.

Darn, none of those gnese are available on this horse.

So the proper term is Varnishing, not Roaning. Even though the effect might be similar, when you use Roaning people might think you are talking about the Roan gene on Kit.

Horses with LP will automatically Varnish. Varnish is the process of lightening the coat by progressively adding white hairs. The rate they Varnish is determined by a number of things. This article talks about some of the different things that change the rate of varnish on a horse. https://wiki.huntandjump.com/books/all-about-appaloosas-wip/page/interactions-of-appaloosa-spotting-with-other-genes

Varnishing can be reduced by not having Varnish Promoter (Vrn) genes, and by having a higher pigment concentration (darker colors). The more dilutions a horse has, the more their varnish is expressed. And females tend to be more varnished than males (subtly).

Cheshire, than you so much for the explanation.

Ah. Sometimes I think I have things figured out only to discover the hard way I was wrong. I appreciate your help