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# Wouldn't that be...
...alkaline?

I seem to remember red/orange as acid and purple as alkaline
(, Fri 15 May 2009, 14:00, archived)
# yes, if you're doing the 'classical' litmus test
DTH on the other hand surely uses a far superior indicator with a different color scheme ;)
(, Fri 15 May 2009, 14:09, archived)