| 摘要 |
<p>The invention relates to a method, which is used for cleaning of metal oxides from natural stones, in which the said metal oxides are formed on natural stones while they are under the ground and especially they are formed on the structure of limestone and sandstone which are used in floor coverings, which is based on the logic of obtaining salt and water as a result of reaction product of the reaction of metal oxides and the acids, and which uses the whitening feature of peroxide compounds.</p> |
