Newton's Disc Card
Spin the coloured disc and the rainbow colours mix to (almost!) white again.
The Newton's Disc Card is used for showing in a simple manner the effect of additive colour mixing. Comprising a card disc printed with the colours of the spectrum. If mounted on a whirling table or similar device and spun rapidly, the colours will be seen to disappear, the disc taking on an overall neutral tint.
Diameter of disc: 180mm.