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When light enters a snowflake, the complex structure of the ice crystals scatter the light into the seven colours of the rainbow.

Churning at a slower speed, as you would typically for gelato, also increases the size of ice crystals.

The dust promotes the formation of ice crystals in the clouds.

Velocity measurements show the ice crystals and snowflakes are either suspended high up or are falling slowly.

It was so cold that the instant I stepped inside — wearing a face mask, earmuffs and mittens for protection — ice crystals began to form on my nose and snowflakes fell from the ceiling.