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Put 7 g of gelatin (Gelatina alba Golddruck), 42 g of water, 50 g of glycerol 85% and 0.5 g of phenol in a 250 ml laboratory plastic bottle and keep it in a water bath at about 60 °C. Shake in between. If everything has dissolved, keep the bottle in the water bath until all air bubbles have accumulated on the surface. Turn the bottle slowly and fill some small 30 ml bottles with the hot solution. Allow to cool.