I started using Daniel Smith watercolours back in 1995. They were the first to include pigment and characteristics information on their tubes and colour charts so I began taking making a note of all that. It was more difficult in the pre-internet days!
I started a book with every watercolour I tried, then another just focusing on Daniel Smith watercolours. This is the second of those books (begun in 2009) as the first wasn't big enough. It includes every DS watercolour made to date. Or very nearly.
I also have smaller notebooks with every watercolour from every brand. I rather like sketchbooks :-)