Mixing Cotman Metallic Watercolour with regular watercolour
Squeeze Pewter into a palette. It can be used diluted or straight from the tube.
Dark colours like Pewter can be used individually to give a sparkling wash of colour.
Light shades like Silver or Iridescent Blue can be laid over dry watercolour paint to give subtle highlights. This is Silver over Turquoise.
Dilute Yellow Gold for a luminous wash or use neat for gold highlights.
Cotman Metallic Watercolour can be mixed with regular Cotman Watercolour to add an iridescent shimmer. This is Yellow Gold and Emerald Green.
Bronze and Red Copper give a warm glow. Lay them over dark tones to give a subtle shimmer or use them undiluted to add detail.