Holbein Gum Arabic Watercolour Medium A la Prima Red Shade or Phthalo Blue

Red Shade or Phthalo Blue Green Shade instead

This makes it a perfect mixing blue for all colours with blue content

This is particularly handy at plein air events when there is a show at the end of the weekend

Add white to these shades and all tones are also possible

I use it for cropping images

Holbein Gum Arabic Watercolour Medium A la Prima Red Shade or Phthalo BlueGum arabic is the medium that binds watercolour together and gouache paints together. You can use This quality gum arabic in small quantities to give greater luminance and a slightly shinier appearance (careful don't use too much, or the drying ability of the paint will suffer). You could create your own paints using this with raw pigments too.