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Ice is a new item in Survival 303 introduced in the Version 6.11 SC. It is effectively the same as water except with 2 major differences.
1. Ice can not be used with a water container (E.g. Bucket, Canteen, Gold Jug)
2. Ice is a lighter blue than water.
You can melt ice with a burning object, but you can't do the same with Waterfalls.  the video provided shows the proof you can get. It's basically setting a burning object over it.