Taste-Safe Rainbow Oats: How to Dye Oats for Sensory Play

These colourful rainbow dyed oats are perfect for babies and toddlers who still like to put everything in their mouths! Find out how to dye oats with food colouring in order to create this taste-safe—and cost-effective—rainbow oat sensory bin for your kids.

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Sensory bins are a great way to entertain toddlers and preschoolers while also helping them develop a variety of different practical skills, like gross and fine motor skills.

We got started with sensory activities six years ago, when my eldest was a young toddler. Since then, we’ve welcomed four more children and tried dozens of different sensory play recipes, sensory bottles, sensory bags and sensory bins.

One of my favourite things about sensory bins is how versatile they are… and how easy it is to throw one together in just a few minutes using materials that you already have at home.

Sure, sensory bins can be elaborate. But often, the sensory bins that children love the most are the simplest ones to make. (My kids will literally play for hours with a Tupperware container filled with soapy water.)

We’ve made sensory bins using a variety of different materials over the years, but one of the things we hadn’t tried until recently was using oats for sensory play.

And while you can absolutely use plain rolled oats in your sensory bins (especially if you’re short on time and looking for something low-prep), we decided to dye our oats with food colouring.

Because every sensory activity is better with a little rainbow added in.

My kids loved this rainbow oats sensory bin, and I hope yours enjoy them just as much! We’ll definitely be making these again.

How to Dye Oats for Sensory Play

Required Materials

Here’s what you’ll need to order to make your own rainbow dyed oats at home:

• Old-fashioned rolled oats (I used ½ cup of oats per colour, but you can make larger quantities if you like)
• Small Ziploc bags
• White vinegar
• Liquid food colouring (you can also use gel food colouring, but you’ll need to adjust the quantities)

A lot of recipes call for liquid watercolour paint, but I prefer to use food colouring to dye oats because I have several young kids at home and I want their sensory materials to be taste-safe.

That being said, be aware that oats that have been dyed with food colouring will never look as bright and colourful as oats that have been dyed with paint. (My kids didn’t seem to mind.)

Note: Make sure you use old-fashioned rolled oats and NOT quick oats. Quick oats will not hold up as well during the dyeing process and are likely to get soggy, which is not what we’re going for with this activity.

Step-by-Step Instructions

1. Pour Oats into Ziploc Bag

To make rainbow oats, start by pouring ½ cup of rolled oats into 6 zip-top sandwich bags (one for each colour).

2. Add Food Colouring and Vinegar

Add 10 drops of liquid food colouring to the bag of dry oats. Then, immediately pour 1 teaspoon of white vinegar onto the food colouring.

(If you’re using gel food colouring, start with just a little bit—you’ll be adding more food colouring during subsequent steps.)

Most of the recipes I found said to add the food colouring to water and then pour the coloured water into the bag with the oats.

I tried both methods, and personally, I prefer to add the food colouring directly to the oats—you’ll probably need more food colouring, but you’ll be less likely to end up with a bag full of wet, mushy oatmeal.

3. Spread Food Colouring Throughout

Seal the Ziploc bag and move the oats around with your fingers in order to spread out the food colouring.

You may find it easier to keep the bag open while you do this, and if that is the case, then feel free to do so in whichever way works best for you.

But if you like to get your child involved in preparing sensory materials, this step would be a great one to let them help out with… and if your kids are the ones spreading the food colouring around, you’ll definitely want to make sure that the bag is properly sealed.

4. Add More Food Colouring

Once you have spread the food colouring throughout the bag of oats, it’s time to add more colouring.

Add 5-10 drops of food colouring to the bag, along with ½ teaspoon of white vinegar. Then, seal the bag and spread the food colouring around like you did during the previous step.

Repeat this process one more time, adding 5-10 more drops of food colouring and an additional ½ teaspoon of vinegar.

At this point, you’ll need to assess whether the oats are colourful enough. Some of the colours will look just fine, especially lighter ones like yellow and orange. But the darker colours like purple and blue tend to require a little more food colouring.

If you’re happy with how the oats look, move on to the next step. If not, add more drops of food colouring and spread them throughout until you’re happy with the colour—but don’t add more vinegar, or you may end up with mushy oats.

5. Let Oats Dry

When you are happy with the colour of your oats, lay them out on a plate or a baking sheet and let them dry.

If it’s sunny outside, you can leave them out in the sun to make them dry faster—as long as you don’t leave them out too long, as prolonged exposure to sunlight will bleach the colours.

Once the coloured oats are dry, it’s time to play! I poured the oats into a small bin and made sure to arrange the colours in rainbow order.

Of course, that didn’t last long once my kids got their hands on them. They grabbed a whisk, some spoons and some plastic bowls and promptly starting mixing all the colours of oats together, scooping and pouring them into different containers.

(Can you tell that sensory bins are a regular thing for us? I don’t even have to lay out scoops and bowls for them anymore—they just go grab them without any prompting from me.)

My two-year-old decided to sneak a taste, but that was not an issue, because the oats were dyed with food colouring instead of paint. It was totally worth having oats that weren’t quite as vibrant in colour in order to know that my toddler would be safe if she tried to eat them.

My four-year-old and my six-year old decided to join in and they had a blast with them, too.

And while it did get a little messy, the oats were pretty easy to sweep up, so it wasn’t nearly as bad as some of the other activities we’ve tried. (My kids were even able to sweep them up without my help!)

Related Taste-Safe Sensory Bins

Looking for more taste-safe and non-toxic sensory activities for your toddler? Check out these articles:

• Taste-Safe Chickpea Foam
• Edible Cheerio Sand
• Taste-Safe Chia Seed Sensory Play
• Edible Yogurt Silly Putty
• DIY Tapioca Water Beads

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