The push for borax-free slime recipes originated from consumer alerts regarding contact dermatitis. Undiluted industrial borax powder has an alkaline pH near 9.3, which can irritate sensitive skin after prolonged handling.
Replacing dry borax powder with contact solution or mild laundry detergent reduces this risk substantially. Saline solutions are buffered to match human tear ducts at an approximate pH of 7.4, making them far gentler on small hands.
For toddlers who still mouth their toys, all synthetic glue recipes must be avoided. In those settings, cornstarch and water doughs, or mixtures made with chia seeds and food starch, are the only safe choices. Regardless of which recipe you use, store finished batches in clean polypropylene tubs away from carpet, upholstery, and pets.
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