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A schoolgirl has issued a warning after she was ill for more than a month due to toxic levels of chemicals -- in her homemade SLIME.

Jessica Moreland, 16, joined the craze of kids cooking up slime using online recipes, and spent up to three hours-a-day in her garden shed making pots of sticky goo.

But after suffering with a cough for weeks, her grandmother Sharon, 52, took her to the doctors who said it was a reaction to borax - one of the chemicals kids use in slime.