Posting Claudette's screen shot of Nermel's kitten's pedigree.
Nermel (visible fur Cheetah! - Maltese Black Chinchilla) is partnered with an European Shorthair - Grey & White and makes a kitten with European Shorthair - Grey & White fur. We have already seen from the first pedigree posted that Nermel is the father of the new European Shorthair - Tuscan Terra when backbred to his mum. Therefore the European Shorthair - Tuscan Terra fur that he hides must be recessive to European Shorthair - Grey & White
This does indeed give us our new most recessive fur.