Boric Acid in Play Doh

Until recently, Mila has been playing with bought Play-Doh from the Warehouse. It’s cheap, colourful, soft and she really liked to squish it. She also really liked to eat it. After trialling making my own play-dough, I realised one other difference – it also never goes off. That got me thinking, I wonder what preservatives are used in Play-Doh, and what are the other ingredients?

As it turns out, the main ingredients of Play-Doh are:

Wheat flour



Silicon Oil

Boric Acid

You won’t find this on their website – where they are irritatingly coy about the ingredients – but Play Doh’s patent reveals that it also contains small amounts of unspecified starch-based binders, a retrogradation inhibitor, lubricants, surfactants, preservatives, hardeners, humectants, fragrance, petroleum additives and colour. Yikes.

Fragrance, petroleum additives, preservatives and colour are all problematic, especially for children. But they’re a lot more ubiquitous. Let’s look for now at Boric acid. Boric acid is a naturally occurring acid of the element Boron. You can findĀ  it in some areas as a mineral in soil, and in fruit and some veges. Sounds pretty harmless so far, right? As Paracelsus, the founder of toxicology said, it is the dose that makes the poison. Boric acid is added to Play Doh as an anti-fungal. Cut fruit will still go mouldy fairly quickly, but Play Doh never will: I’m guessing because the levels of boric acid it contains are much more than we would naturally find.

Boric acid has wide-ranging industrial uses. It’s used as a rodent and roach-killing pesticide, antiseptic, in weedkiller, anti-rot timber treatments, photography chemical solutions, disinfectants, flame retardants and in nuclear plants. Our family has recently switched to organic produce in order to avoid pesticides, so seeing pesticides turn up in her play things – especially one that she does eat bits of – does not make me a happy camper.

Information about boric acid is very mixed. You can find everything from the acid as a dietary supplement (!) to a deadly toxin. However, the majority of non-industrial sites suggest that while acute poisoning is rare, ingesting boric acid or having repeated exposure to it is definitely something to avoid. Repeated exposure to boric acid can cause sexual development problems, infertility, weight loss, skin and lung irritation and liver or kidney damage. In the United States, the Environmental Protection Agency classes boric acid as moderately acutely toxic, but has yet to define “safe” limits for the acid in food and edible products. My suggestion would be zero tolerance, but the EPA has yet to call me ;). In New Zealand, boric acid containing pharmaceuticals are classed as restricted medicines.

I’m not suggesting that your kid gumming a mouthful of salty dough will prevent you from having grandchildren, but there is also no way I want my kid eating this kind of chemical cocktail. Yes, the packages of Play-Doh are marketed for 3+ years, but that seems like a bit of butt-covering to me; squishing dough has long been a fun past-time for toddlers well below that age.


So we’ve swapped commercial dough for home-made. It doesn’t last quite as long, but it is far more exciting to mix up a batch of something totally different each time.

Here’s my very simple recipe, for salt-free edible peanut butter dough:

1 cup peanut butter (get 100% peanuts, or at least no salt, no sugar added)

1 cup icing sugar

1 cup flour

Add these three ingredients, then enough hot water to work into a dough.

I love the idea of sensory play doughs: adding oatmeal or rice (for eaters) and glitter or sand (for non-eaters) to home-made dough. Unlike the commercial stuff, the possibilities for home-made are endless.

No salt play dough

Natural play dough recipes

How to make natural dyes for play dough

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  1. Thanks for looking into that. We mostly have home-made play doh at home, but also a few small tubs of the bought stuff. My daughter has never showed an interest in eating it, so at least that’s ONE thing I don’t need to worry about too much.

    Interesting about the Borax possibly being a poison. I use it in my homemade dishwashing powder and laundry powder. I hope that’s not dangerous. Mmmm.

  2. Boric Acid is not a restricted medicine, and as an aside, being a restricted medicine is not an awful thing – what it means is that it can only be sold by a pharmacist, in a pharmacy (they are also commonly known as ‘pharmacist only medicines’).

    Boric Acid in medicines for internal use containing 6 milligrams or less per recommended daily dose; for dermal use other than paediatric use in medicines containing 0.35% or less; when present as an excipient – is general sale (meaning it can be sold anywhere) in medicines containing more than above it is a prescription medicine. This doesn’t really apply to Playdoh though, as it isn’t a medicine! An easier (and more up-to-date) place to find the classification of a medicine is here: – the classification of a medicine dictates how & where it can be sold.

    Also, from Martindale (a well-established drug reference) boric acid does not readily penetrate intact skin – so playing with Playdoh, is not such a problem – eating it is another story though and there are restrictions in other countries about it’s use in products for children (perhaps why it has the not for under 3 year olds warning).

    However, I would agree that plenty of under 3 year olds play with playdough – and I would advise (as the recipes you have given suggest) that making your own is going to be the best (and safest) option.

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