Silver nitrite - ( Nitrate ) is the problem. Slynky. See if you can drop the solutions off at school. OR if you know somone who works at a professional film developing place, ask them to take care of it. As I recall the stop bath is not too bad ( isn't that the one with the vinegar smell? If it is you can pour that down the toilet and flush. ) The fixer as I recall is formaldaheyde. Which also is not so bad. However you might not want to cuddle up to it when you sleep. Why don't you read the label it should have disposal directions. Bsteph