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Kubis Ungu - ( Asam = Merah tua ) ( Basa = Kuning )
Kunyit - (Asam = Kuning ) ( Basa = Merah )
Indikator Buatan :
Timol biru - ph = 1,2-2,8. ( Asam = Merah ) ( Basa = Kuning )
Metil Jingga ( MO ) - ph = 3,1-4,4. ( Asam = Merah ) ( Basa = Kuning )