Petrolagar : no. 1 blue label (plain) ... no. 2 red label (phenolphthalein) ... no. 3 green label (alkaline) ... / Deshell Laboratories Ltd.

In copyright

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Credit

Petrolagar : no. 1 blue label (plain) ... no. 2 red label (phenolphthalein) ... no. 3 green label (alkaline) ... / Deshell Laboratories Ltd. In copyright. Source: Wellcome Collection.