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Just my humble opinion, but when you sign up to study with someone whose work you admire, you'll get the most from the course by complying with their request for specific materials.
Although Martin F. Weber has been in business making paint since the 1850's, Sargent had only four years of life left to enjoy "Permalba" when it was introduced in 1921.
It's a proprietary mix of pigments based on titanium white. It's a bit transparent, which indicates zinc white, and the handling character no doubt owes to pigment additives, perhaps blanc fixe. It's a useful, pleasant-working "mixing white".
Safflower oil is the vehicle, and the paint comes in a plastic "bladder" tube like toothpaste nowadays . . . both of which I find annoying.
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