Page 7, the photo shows a black velvet and your caption mentions standard. Page 18, that photo is not a gray standard. MCBA and Empress do not recognize the terms pastel or pearl. Normally those terms are used in the mink and fox industry. In fact, the term platinum is used to describe color phases in mink and fox.
Black velvet is a spotting gene that behaves similar to saddles in dogs.
You are working with a black spot. However you must be careful when using the term black. Until some brave sapphire breeder has a simple blood test done by a DVM, the question about sapphire chinchillas and their known health problems will not be resolved. CHS suffers have abnormal neutrophiles and eosinophiles blood cells. Good quality violet chinchillas do cost money.