Please see below a chart of Citroen paint colours and the closest dolphin sensor colour match, in some cases the match may be good enough not to have to bother with any spray paints, in other cases a thin layer of non-metallic paint may be used to improve the match

Citroen Paint Colour Name	Dolphin Colour Name	Dolphin Sensor
Perla Nera Black	Black	Click to Enlarge
Black	Black	Click to Enlarge
Storm Grey	Iron Grey	Click to Enlarge
Nicciola	Iron Grey	Click to Enlarge
Iron Grey	Iron Grey	Click to Enlarge
Thorium Grey	Grey	Click to Enlarge
Arctic Steel	Silver	Click to Enlarge
Bourrasque Blue	Sea Blue	Click to Enlarge
Mauritius Blue	Sea Blue	Click to Enlarge
Suroit Green	Bottle Green	Click to Enlarge
Mativoire Beige	Champagne	Click to Enlarge
Deep Red	Maroon	Click to Enlarge
Polar White	White	Click to Enlarge

Please note that colours may differ slightly as monitors have different colour settings