How to make a glycerin candle
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Take 5g of gelatin, 25 ml of glycerin, 20 ml of water and 2g of tannin.
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Mix gelatin, glycerin and water while heating until the mixture is transparent.
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Dissolve tannin in 10 ml of glycerin while heating.
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Add this solution into the solution of glycerin, gelatin and water.
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Boil the final solution; if the solution is not transparent yet, it will become later.
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Boil the solution until the water is gone.
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Make candles out of the result