I tried to cast this footprint using alginate. Alginate is like a rubber which sets really fast (8 minutes after mixing). Its a very delicate material which unfortunately I didn't use properly. I dont think I used enough water or mixed it throughly enough because it came out of the bucket quite lumpy and gooey. Needless to say it didnt pick up the imprint of the footprint which was really disappointing. Hopefully I'll have better luck next time.
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