White indicates special precautions:
W – Indicates a material that shows unusual reactivity with water (i.e., should never be mixed with water or have water sprayed on it). Magnesium metal is an example.
OX – The material possesses oxidizing properties. Ammonium nitrate is an example.
ACID – The material is an acid.
ALK – The material is a base.
COR – The material is corrosive.
Radioactive symbol – The material is radioactive.
