Derwent Professional Inktense Block Sets

I have used Inktense pencils on small projects for their vibrancy, so I was excited to be able to use these colours in larger areas. These blocks deliver! Use like watercolour paints on wet paper, lay down blocks of dry colour and spray with water to let them do their thing, or use dry for detailing.
My set arrived intact, with plastic sealing the tray inside. However, they were a little muddy looking, as if they'd been shaken and the pigment spread. Although each block is imprinted with it's colour number, most of mine were unreadable, and several dark blocks were indistinguishable in colour on paper until I did a very watery wash. I'd like to see them identified in a clearer way. There is also no colour chart on or in the tin, so I had to look online for this.
Altogether, I'm glad I bought these for their vibrant colour and ability to add layers without reactivation.