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?
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.