Handle reactive chemicals with all proper safety precautions, including segregation in storage, and never mix even small quantities with other chemicals without appropriate personal protection and precautions, or without definite knowledge that is safe to do so. Corrosive and contact-hazard chemicals Corrosivity, allergenic, and sensitizer information is given in the MSDS and on container labels. Symptoms may include itching, swelling, skin eruptions, or respiratory distress. Sensitizer is a material that on first exposure causes little or no reaction, but which on repeated exposure may cause a marked response not necessarily limited to the contact site. Skin sensitization is the most common form although a few chemicals may cause respiratory sensitization also.
People vary in their response to allergens and sensitizers.
Do not assume that you will react or not react to a substance based on others' experience. Always use suitable precautions. Includes acids and bases, and can degrade steel at a steady rate. Examples include buffered chemical polish, sulfuric acid, sodium carbonate, regular mortar, and Drano. Many corrosive materials exhibit additional hazards.