As doctors warn it can cause a dangerous reaction with a host of common drugs... 1  Researchers warn that grapefruit reacts with many medicines. 2  The fruit can cause devastating side-effects from stomach bleeding to kidney problems. 3  Doctors say the public is ignorant to the dangers and putting themselves needlessly at risk.
According to the definition of the question (based on light reflection and not light emission), a well-polished mirror is the the whitest substance on earth. The main reflection layer is usually made out of silver.
Somewhere in between lies âdaylight whiteâ, which is pretty much the whitest kind of white. Cool, warm and daylight are pretty imprecise terms, though. Itâs useful to have a more accurate system to indicates the tint of the light. That system is called the colour temperature, or Correlated Colour Temperature (CCT).