The last time I used this product it was made by someone else, Agfa, and under a different name, Rodinal. This bottle of Adonal by Adox should last for quite a few rolls of film, 100 or more. And it likely wont expire in the process. This stuff gets diluted 1:50 with water or 1:100. Compared to 1:1 that I was using with another developer this stuff is much more concentrated. That lets me develop two 36 exposure rolls of film with about 5ml of developer instead of 250ml. Expect to see some more film stuff in the future as I get my darkroom activities back under way.