Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Dye-stained formula. At left is a beaker containing the formula, but no dye. In the center is a beaker containing the formula and FD&C Blue No. 1 dye at a concentration of 0.8 mL/L. At right is a beaker containing the formula and FD&C Blue No. 1 dye at a concentration of 1.5 mL/L.
