This is something I purchased about 11 years ago when I took a color therapy course. The liquid in the bottles has slightly decreased due to aging. Please check the photos. Also, I made some notes in the booklet when I took the course, so please check the photos. There are stickers with numbers on the bottom of the color bottles. It has only been stored at home and has not been taken outside, so it is in relatively good condition. I am selling it because I have no opportunity to use it.