The bacteria were also given genes to make them produce an enzyme that would react with a chemical added to the growth medium.

Colour is achieved by using minerals or chemicals added to the processed lacquer.

These chemicals can add significantly to the environmental impact of treated products, making timber recycling more difficult.

The chemicals added to New York's water system coat the pipes.

The ballots will be burned, with chemicals added to create white smoke that emerges through the chapel's chimney in the famous signal.

This chemical is used in the production of microwave popcorn and adds that buttery flavor.

Many chemicals added to the plastics can be absorbed by human bodies, which could lead to an array of problems later in life (Holgado, 2009).

Optical fibers (with special chemicals added) can be used as optical amplifiers.

These chemicals make people less hungry and sleepy, and also adds an intense feeling of excitement.

But with other chemicals added, it also speeds up growth to a startling degree.