Mixing Colours with Squishy Bags

These squishy bags are a great, mess free way to experiment with mixing colours. After we’d finished experimenting making different colours we put a sheet of card inside each paint filled bag, sealed them up again and used them to practice forming letters and numbers with our fingers.

Here at Science Sparks we’re trying to reduce the amount of plastic we use, so do wash out the bags and save for another activity once you’ve finished.

mixing colours materials


Small sealable plastic sandwich bags

Red, yellow and blue washable paint

Small sheets of cardboard/stock


Place a two small blobs of different coloured paint into each bag.

Carefully seal the bag and gently squish the colours together until they mix. You should find:

Yellow + Blue = Green

Red + Yellow = Orange

Blue + Red = Purple


mixing colours activity

colour mixing bags

Once you’ve finished experimenting place a small sheet of card inside each bag and carefully seal it up again.

Try writing letters and numbers on the surface of your bag, wipe the surface clean and then try again.

colour mixing ideas

Mixing colours – why does this work?

What are primary colours?

Primary colours cannot be created by mixing other colours together.

Red, Yellow and Blue

Secondary colours are made by mixing primary colours.

Tertiary colours are made by mixing a primary colour with a secondary colour.

Always supervise small children when using paint and plastic bags

Mixing colours with squishy bags

There are 2 comments

  1. DaNel Hogan

    I love this activity and we are using a version of it scaled up to butcher paper sealed inside a clear shower curtain with our local children’s museum. However, we are using the REAL primary colors and hope you might change this to match the physics of color.
    Why not use the real primary colors of paint – cyan, yellow, and magenta? This reinforces the wrong information for children. We do not use red, yellow and blue in our color printers and copiers. We use the real primary colors – cyan, yellow, and magenta.

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