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The composite material comprises chopped fiberglass, aluminium hydroxide and a type of clay derived from volcanic ash as additives.

In a phase I trial, the researchers gave 35 women aged 19 to 45 either a version of the vaccine that included aluminium hydroxide, or one that included lipid molecules or a placebo.

Some flame retardants, including the most commonly used - aluminium hydroxide, are generally considered to be safe.

The next group precipitate may contain the white gelatinous aluminium hydroxide, the greenish chromium hydroxide, reddish ferric hydroxide, and possibly zinc and manganese hydroxides.

If the fiber is now dipped into a solution of the dye, the aluminium hydroxide combines with the color material and fastens, or "fixes," it upon the fiber.