Quote – Richard Kiefer Jr., corporate safety director of the McCloskey Varnish Company.

We must all be aware of one very basic fact: all, absolutely all, chemicals are potentially toxic substances….The key, as I have previously stated, is the quantitative level, the concentration at which any chemical substance is present. Thus anything, I repeat anything, present in an excessive amount is a toxic substance. You cannot legislate against every conceivable chemical substance and therefore, the need for a truly meaningful definition for a toxic substance should be evident.

Testimony before the Philadelphia City Council. From the Council of the City of Philadelphia, Committee On Public Health and Welfare.

Tuesday, October 7, 1980