If you are interested in helping the environment you might be interested in using a developer that does not contain hydroquinone. This chemical is particularly toxic to fish should any get past sewage treatment. There are several ascorbate based print developers on the market. If you are interested in mixing your own I would suggest Ryuji Suzuki two formulas DS-14 and DS-15. An advantage of ascorbate print developers is that they produce greater detail than hydroquinone based ones. This is because ascorbate produces less infectous development than does hydroquinone. The difference is quite striking.