A short time ago I ask a question;
What does; Richard Of York Gave Battle In Vain and Every hunter Wishes To Know Where The Pheasant Sits have in common?
Answer;
They are both mnemonics to remember the order of the colours of the rainbow using the capital letter of each word. For English speakers this is; Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROY GB IV is another way to remember)
For Russian speakers this is; red, orange, yellow, green, SKY BLUE, BLUE, violet
In Russian sky blue or light blue is perceived as a separate colour from blue, which seems odd to us but then we have a colour pink – which is really a tint of red. A tint is made when you add white to a colour (light blue is a tint too) A shade is made by adding black
For more information visit Master Russian
Just to shake up the rainbow even more, when Sir Isaac Newton used a prism to break up white light he added indigo for occult reasons and it is a shade of blue. That is why modern renditions of the rainbow – including the Gay Pride Banner and Dark Side of the Moon album cover for Pink Floyd – have only six colours.