A single pot of Stockmar opaque paint (opaque colours) in Prussian blue (colour 18): a deep, strong blue. Use it to top up a Stockmar paint box when a colour runs out, or to put together your own favourite colours.

The paint is highly concentrated, so the colours stay radiant even when well diluted. You can use it for opaque painting, but also for classic watercolour, the veil painting (lazure) technique or a combination of techniques.

• Colour 18, Prussian blue
• Single pot, diameter 30 mm
• Suitable from 6 years