Once one of the most difficult colors to recreate in paint, blue was only available to medieval artists, for example, by grinding up the prized stone known as lapis lazuli. By the 1900s, it was still ...

Three 100-mg samples of the powder were mixed with 2.5 mL of 8.4% sodium bicarbonate in sterile water for ... Transfer the powder to a 600-mL beaker and add 340 mL of Sterile Water for ...