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The ban covers 4,000 chemicals including isopropanol alcohol, a common ingredient in tattoo inks, although officials say substitutes are already available.

If they fill the pores of their polymer coating with isopropanol, the coating starts to trap heat rather than shed it.

In this way, they probed a buoyant bubble trapped inside a thin tube filled with an alcohol called isopropanol.

The excess emissions included cyclohexane and isopropanol; the latter has been deemed an eye, skin and respiratory irritant.

Investigators found high levels of butyl alcohol, isopropanol, and acetone as well as ethylene glycol.