In article ,
J. P. Gilliver (John) wrote:
In message , Mike Tomlinson
writes:
In article ,
Terry Casey writes

Finally, the sleeving was changed from green to green/yellow ..

IIRC, it was to make it easier for colour-blind people to identify.

Yes - green/red being the commonest form of colourblindness. Though
making one stripy meant anyone could get it. (A physics master - I think
it was - once told me: brown is what you'll go if you touch it, green
and yellow think buttercups on grass i. e. earth.)

Old German (flex - I don't know about house) colours were red, black,
and grey - I can't remember which was which. I have an old globe with
these colours.

Red was earth!

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