Puzzled by indigo - part 2

In my quest to work out which Anchor colours to use for a rainbow, I've found a few different opinions online of what colours are actually in a rainbow. For instance:

The seven colours of the rainbow
Red (#FF0000) (RGB: 255,0,0)
Orange (#FF7F00) (RGB: 255,127,0)
Yellow (#FFFF00) (RGB: 255,255,0)
Green (#00FF00) (RGB:0,255,0)
Blue (#0000FF) (RGB: 0,0,255)
Indigo (#6600FF0 (RGB: 102,0,255)
Violet (#8B00FF) (RGB: 139,0,255)

A version that assumes that blue and indigo are today's cyan and blue
Red (#FF0000) (RGB: 255,0,0)
Orange (#FF7F00) (RGB: 255,127,0)
Yellow (#FFFF00) (RGB: 255,255,0)
Green (#00FF00) (RGB:0,255,0)
Cyan (#00FFFF) (RGB: 0,255,255)
Blue (#0000FF) (RGB: 0,0,255)
Violet (#8B00FF) (RGB: 139,0,255)

Or a six-colour one, promoted by Facebook group "Get indigo out of the rainbow" on the basis that indigo is actually a tertiary colour)
Red
Orange
Yellow
Green
Blue
Violet

I rather like this one. It seems logical. I've photographed my colour swatch of all the colours I've got and have started using the colour picker tool in Photoshop to identify my best red, orange, yellow, green, blue and violet.






I've also done an index of all the colours, which I'll print out and laminate for reference in picking the right shade in future projects. The sewing didn't take long but sorting the list took ages (primarily because I kept changing my mind about how to describe the colours - I finally opted for the Anchor ones, with an indication of light, medium or dark). However, I feel it was time well spent. And I think I'll make the larger swatch into a little bag so that it can be used for something else when it's not required for colour-checking purposes.