Colour chart

How much do you think this should cost? I was amazed when I was told £90! I placed it against photos of my Lathyrus today and was very careful with it. 

The reason it is so expensive is because you can take a photo with it in whatever light and whatever conditions and, through having this card and matching the colours to ones online, you can get the exact colours the rest of the things in the picture should be. This is really helpful for me with very varying light and trying to match colours. 

Seven hours of taking photos today and my back is aching! Another full day tomorrow and hopefully that'll be most of it done