| 摘要 |
A method for producing an ice surface for an ice rink by freezing water to which an inorganic substance is added is characterized in that the inorganic substance is ammonia, an alkali hydroxide or alkaline earth hydroxide, a hydrogen halide, nitric acid, sulfuric acid, phosphoric acid, an alkali salt, alkaline earth salt or ammonium salt of said acids, or ammonium-bicarbonate, or a mixture of several of said substances.
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