Well, you can just order if you like, but unlike his old handwritten catalogs (he stubbornly resisted going computer for ages), which had a lot of info about the colors, especially the historical ones and Robert's own creations, the site seems to have nothing but the swatches and the same spiel about how suitable they are for your next masterpiece.
So if you want to know more, unless he's got an assistant to do the explaining, it'll be Robert, who will likely grill you on what type of art you do and demand to know why you want to use that color and what for. Robert is one of the last of a dying breed, a genuine New York City character. Which means he's a bit gruff until he knows you.
The colors are all superb, but as mentioned they are slow driers. He also sells a wide variety of mediums which aren't listed on the site, canvas and a bunch of other stuff. His store in Williamsburg, Brooklyn, is a dangerous place to be-- you'll end up buying more stuff than you thought you would when you came in.
The guy who runs this place apprenticed to Robert, but I never tried any of his paints. He doesn't have the wide range of colors Robert has, nor of course any of Robert's proprietary colors like Egyptian Blue and Egyptian Violet, both of which are totally gorgeous, but I expect the paints are of comparable quality.
Blue Ridge Oil Paints