Lead is highly toxic and can cause anemia, kidney damage, brain damage, and reproductive problems. Some chemicals can also damage the skin. Your skin may become dry and cracked, or you may get a rash or burn. Other chemicals can go right through the skin and get into your bloodstream. Certain chemicals do both.
Some products are more hazardous than others.
Don't open the container until you've found out what's in the product and what the hazards may be. Check the label . You may find a list of ingredients, a safety warning, or both. All containers must be labeled, or a labeled container must be in the immediate area. MSDSs are required by law, and everyone working on the site has a right to see them.