Skin undertones can be identified by observing the color of wrist veins.
Blue or purplish veins suggest a cool undertone.
Cool undertones are characterized by subtle pink, red, or blue hues in the skin.
Green veins indicate warm undertones, resulting from the interaction of yellow skin tones with blue veins.
Vein color is not typically assessed for red or orange undertones.
Consequently, blue veins are indicative of a cool undertone.