(a) A person shall not sell, specify, or require the application of a coating, ink or adhesive on a substrate if such activity is prohibited by any of the provisions of this Part. The prohibition of this section shall apply to all written or oral contracts under the terms of which a coating, ink or adhesive is to be applied to a substrate. This prohibition shall not apply to the following:

1. (1) ink, coating, or adhesive used in printing processes where control equipment has been installed to demonstrate compliance with this Part; or
2. (2) ink, coating, or adhesive used in printing processes that have been granted variances for reasons of technological and economic feasibility per section 234.3(f) of this Part.