Tiffany blue, also known as Robin Egg Blue, has been registered as a trademark. Its color is between blue and green, which is a little lighter than ordinary robin egg blue, so it looks fresher and more elegant.
Robins symbolize happiness, and their eggs are blue, so this color has become the happiest color in people's hearts.
Prussian Blue-Picasso's Favorite Color
Prussian blue is iron ferrocyanide, also known as Berlin blue and Gong blue. This is a double salt, which generates ferrocyanide by reacting potassium xanthate with ferrous sulfate in weak acidic solution. This color was used in the uniforms of the Prussian army, the predecessor of Germany, hence the name Prussian Blue Prussian Blue.