Mixing pastel colours was my challenge for the Powertex UK Design Team this month. I mixed pastel colours with Powertex Universal Medium for some simple Spring bottle vases. I like to mix my Powertex colours but it’s not familiar to everyone so here’s a short guide to Powertex colour mixing!

Why should I mix Powertex colours?

Powertex Universal Medium comes in a range of 10 great colours but sometimes we want to work with something different. Powertex colours are all mixable and the colours won’t split or separate. Mixing your colours will keep all the properties of Powertex too so it will still be weatherproof except if you use the Transparent.

Getting the right base colour can make all the difference in your project. It opens up new possibilities for your creations and your artwork and gives you a strong coloured base from the start.

Mixing colours with Powertex Universal Medium

The basics of colour mixing

I’m mixing my colours from Red, Blue and Yellow Ochre Powertex Universal Medium.

  • Red and Yellow Ochre make Orange
  • Blue and Yellow Ochre make Green
  • Red and Blue make Purple

Powertex Colour mixing wheel swatches

This is a very simple colour chart, there are of course endless shades to mix. I mixed two colours with each combination as I’ve explained below. You can use this chart for your own reference but remember that my photo and the computer screen may not show the colour exactly as it was!

Mixing purples

Mixing Purple with Powertex

This has to be my favourite! Powertex mixes delicious purples like these. Start with either red or blue and add a little of the other colour at a time until you get a shade you like. See the more “dairy milk” purple is mostly blue with a little red. The yummy “berry” purple is more red with a little blue.

Mixing oranges

Mixing orange with Powertex

You will only need a tiny amount of red to make the Yellow Ochre turn Orange! Adding Yellow to red has much less effect. When mixing anything with a lighter colour, always add a tiny amount of the darker colour at a time. In this case, adding a little red to the Yellow Ochre has darkened it a lot. It’s possible to get a much more “yellow” mix than this.

Mixing greens

Mixing green s with Powertex

You can buy Green Powertex but if you don’t want to buy a whole bottle, you can mix it with Blue and Yellow Ochre. Start with your yellow and add tiny amounts of the blue until you have a colour you want. The colour will change from a leafy green to a rich turquoise. You can also lighten all your mixes with Ivory if they are too dark, just add a tiny amount at a time.

Top tips for mixing Powertex colours

  • Powertex has a working time of about an hour
  • Once poured it starts to cure so mix up only what you need
  • When dry add a gloss or pearl finish with varnish or pigments to show off the colours
  • Use white or pearl highlights on textures to create depth

Powertex row of fairy houses

Pastel and other Powertex colour mixing

Pastel colours are created in the same way using Ivory. Start with Ivory and add small amount of your colour at a time. You might want to try mixing neutral greys or brown tones for textured art. If you’re struggling to get the colour you want, try adding in Powercolor pigments in tiny amounts to adjust your mixture.

Find out more

If you’re new to Powertex, you might find my beginner blogs useful. I’m a certified  tutor and I get my supplies from Powertex UK.

[Updated August 2022]

Mixing a rainbow colours with Powertex


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