Hi
For this to be a perfect proof with a certainty of 100%, it needs to be shown that :
1 Norville and Amena BOTH hide toyger snow and neither can hide a more recessive fur. This would make 'Test kitty cobalt' pure and the proof valid.
2 The cobalt source is Nadia. This is certain as she hides tuscan terra or more recessive and can't hide toyger snow.
Point 2 is proven, so lets consider point 1.
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Norville - His parents are both Numoo They are Meowsical and Meownerva, both my line and 1256 days old.
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Meownerva hides chimera black grey or something from moohammed (which could include toyger snow)
Meowsical got the numoo from a starter and hides toyger caramel or cheetah maltese (see my pedigree) or more recessive He cant hide toyger snow
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Ameena - Her parents are both Numoo. All four grandparents are Numoo at 1289 days old . But this does not confirm she is solid
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Unfortunately this is where it isn't certain. The pedigrees prove the source of the toyger snow is either of ameena's grands or Meownervas grands. And there is nothing to suggest the lines are related. There could be something more recessive behind any of these cats. Either of Ameena's grandparents, or Meownerva dad's line . We know one must be toyger snow, but not which one. And can't prove more than one is a snow.
CHecking the dates, was anything more recessive than toyger snow available
The cheetah maltese black chinchilla was discovered in december 2021 which is 1460 days old (-100 or so for the cobalt discovery date) which is within the range for all of the cats relevant.
So unfortunately this is not a perfect proof.
BUT
Grace you need to breed Test kitty cobalt to a euro grey (anything below that wasnt available at the time) and see if you can pull out what Test kitty is hiding!! And that, if it is toyger snow, is a proof
I found Dell Dastardly which shows he hides ocicat platinum behind the caramel so it is a possibility your test kitty is hiding that as one possibility