How do you prepare your own olfactory indicator explain

1.	How do you prepare your own olfactory indicator explain
Answer» as well SOAK acid free art paper or a kitchen sponge towel (kitchen paper towel) with the juice and let it dry to make "LITMUS paper". Note that most paper towel paper is ACIDIC and you will therefore GET red litmus paper even if you start to make the paper from a neutral elderberry juice solution.

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