Here is a link I discovered that gets down into the details of colors, plus it basically has cross references to all brands and all color names:
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Hex Color Codes, Paint Matching and Color Picker
Hex color codes, HTML colors, paint matching, directory and color space conversions.
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(encycolorpedia.com)
The front page is fairly sparse, so you have to type in a search term, or you have to click on the hyperlinks under the search bar.
I found this because I had an existing paint in my home that I wanted to match and I was looking for RGB values (I find the sampling technique a little fussy). So I just make a new material in SU and type in the RGB values. Volia!
This site breaks down your chosen color into 22 "colorspaces" (e.g., RGB, RGBA, RYB, Hex, HSV, and an host of alphabet soup which I don't understand), shows "color wheel" compliments, analogous, split, triad, square, etc..., hues and saturation variants, related colors, color variants, and a complete mapping to all colors to paint schemes from all paint manufactures (I can't count them all) to include home (Behr, Glidden, Sherwin-Williams), designer (Martha Stewart, Ralph Lauren) Automotive (DuPont), Models (Testors, Revell), and even Crayola!
I think if you want a great resource for the real details of color this is it! Plus -- the place isn't plastered with advertising and doesn't ask for registration or a fee. I think I saw one advertising banner inconspicuously placeed somewhere on top.
Let me know what you think!
Frank