Potential answers for "Source of litmus"

⭐⭐⭐⭐ LICHEN
⭐⭐ ALK
⭐⭐ ACIDS
⭐⭐ DYE
⭐⭐ REAGENT
⭐⭐ ALKALI
⭐⭐ ACID
⭐⭐ PHS
⭐⭐ TEST

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Declines   Stable relatives   Counter system