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Xanthophyll differs markedly from carotin in its solubilities, being insoluble in petroleum ether and only sparingly soluble in carbon disulfide.

As an example of a lipochrome which has been isolated, crystallized and purified, we may mention carotin, which has recently been found in green leaves.

This observation suggested the chemical relation between the vitamine and carotin.

To separate the carotin from xanthophyll place the ether solution in a small open dish and evaporate to a small volume.

Yellow tomatoes have only carotin as their skin-pigment, while lycopersicin is usually present in the flesh of the ripe fruits of all varieties and in the skin of red ones.