Hot Wheels Color Racers

More will be added - In 1988, Mattel introduced Color Racers.  These cars had a second coat of paint that was thermochromic - sensitive to temperature.   This paint could only be seen when the vehicle was cold, otherwise it remained invisible.  The basic color that these cars maintain depends on the thickness of the second coat of paint.  Within about eight years time most of the Color Racers did not change anymore, and the rest need extensive heat or cold to change color.

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