It is important that persons involved with photo processing, be aware of these hazards and that every effort is made to minimize the effects of these chemicals on the health of the community. For example, many photographic processes produce toxic gases. These gases may be released slowly from baths or stored chemicals as they age. In addition, these gases are usually generated at faster rates if the photochemicals are heated or if certain chemicals are mixed with acid. An effort to minimize the hazards associated with photographic chemicals begins with familiarity with the MSDSs and proper handling and disposal of these chemicals.
Developers are skin and eye irritants and many are strong allergic sensitizers.
Some common ingredients in developers are hydroquinone and sodium sulfite. Hydroquinone can cause depigmentation and eye injury after five or more years of repeated exposure, it is also a mutagen. Darkrooms should have access to an eyewash fountain and safety shower for such emergencies. Ensure good ventilation of the darkroom. The acetic acid commonly found in stop baths can cause dermatitis and skin ulceration and can severely irritate the respiratory system.