Braille Letter J Flag, Juliet

The Braille J Flag is red and white.  Since J is the 10th letter it is represented by the colours coded to red and white.  Red is coded to one while white is coded to zero.  Since red is the 1st colour of the rainbow it gets a 1.  

Braille Letter I Flag - Igloo

The Braille Letter I Flag is mostly pink because the pink is assigned to the number 9 and I is the 9th letter in the alphabet. 

Braille Letter H Flag - Hotel

The Braille Letter H flag is mostly black since the 8th position is assigned to the colour black, with its contrast indicator is white.

Braille Letter G Flag - Golf

The Braille Letter Flag for G is mostly violet.  The reason being, violet is the 7th colour of the rainbow and G is the 7th letter of the alphabet.

Braille Letter F Flag - Foxtrot

Since indigo (dark blue) is the 6th colour of the rainbow and F is the 6th letter of the alphabet, the Braille Letter F flag is indigo (dark blue).  The assigned contrast indicator for indigo is white, which is why white is included.

Braille Letter E Flag - Echo

Since E is the 5th letter of the alphabet and blue is the 5th colour of the rainbow, the Braille Letter E Flag is blue.  Red is included since it is the assigned contrast indicator for azure-blue.

Braille Letter D Flag - Delta

Since green is the 4th colour of the rainbow and D is the 4th letter of the alphabet, the Braille Letter D Flag is mostly green.  Yellow is included since it is the assigned contrast indicator for green.