I got some chemicals with my second hand darkroom gear and a small bottle of KRST was included. It's not sealed, but it's a full bottle. I've no idea how old it is, it could be 5 to 10 years old. It has the old Kodak logo and the text "9917 C7 001800" printed on the label. I don't know if it's true or not, but I had seen somewhere that the first part (9917) means that it was produced in the 17th week of 1999, making it 10 years old. The liquid is clear and stinks horribly (ammonia). So, is it good or should it be disposed?
BTW, I also got a packet of Kodak Sepia toner (1 quart). I assume it's ok.