Sodium carbonate hand wash
Mildly alkaline (about pH 11) wash solution collected in a sealed glass bottle from the suspect's hand or pocket. Alkalinity is needed because phenolphthalein only develops its pink colour above pH 8.2.
Mildly alkaline (about pH 11) wash solution collected in a sealed glass bottle from the suspect's hand or pocket. Alkalinity is needed because phenolphthalein only develops its pink colour above pH 8.2.
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