China Pharmacopoeia Part III Neutral Ethanol. In China Pharmacopoeia (20 15), Part III P800 1, the ability of non-aqueous titration to give protons is different from that of general titration, and the range of indicating discoloration may change (in fact, phenolphthalein is originally soluble in ethanol). But since it is titration, the indicator will finally return to neutral (that is, the light pink of neutral ethanol). Before use, the whole system should be adjusted to phenolphthalein neutrality and organic acids should be added.