Wig and hair color

I'm working on a story and I'm having a bit of trouble with describing hair.

Styles aren't too big a problem really, I've been able to find fairly good representative samples of most styles on the net.

What's killing me is trying to get colors right. I've been searching the web for a couple of days now looking for some site which can serve as a good reference to the names for various shades of hair.

My protaganist starts out in a platinum blonde wig ... no problem there as everyone recognises platinum blonde. But then later the character changes to a much softer blonde wig, and that's where the problem starts.

This page and this page both have identical pictures. Yet in one the color is described as caramel blonde and the other it's honey blonde.

I realise that I'm probably being too picky on this - but the fact is I have always had difficulty with shades of hair. It wasn't a problem when all my output was just for me, but now that I've decided to actually POST a story I'd like to at least try to get up to speed on hair shade.

I did have one idea ... wig sites. But I'm afraid that I can hardly say "She placed the Racquel Welch 'Magic' style wig in R14/25 on his head and straightened it carefully" :D

I had great hopes that the Fischer—Saller scale might help, but that's proved no use.

So to all that came before me ... can anyone recommend a good reference for hair colors?