40cc water-based poster color Set of 2 black and 2 indigo. Only 1 black bottle has been opened, the other 3 are unopened. The used bottle was only used a little, and weighs 71g compared to the unopened bottles which weigh 76g. It hasn't hardened and seems to still be usable. Please be aware that these have been stored at home for a while. Recommended for those who frequently use black and navy. #Paint #Watercolor