Erode carving technique, the carving effect is good or bad, except the technique procedure, the proportioning and choice of corrosive, the stone character, processing way will affect the result greatly.

       Stone character mainly contain chemical component , mineral component, structure etc.

      1. stone chemical component
      The choice of escharotic is decided by stone chemical component. Different escharotic decide the different speed of reaction, thus to cause the great effect on carving speed, carving effect, for example, marble whose mainly component is carbonate, so it is better to choose escharotic made from HCI, while for granite, whose mainly component is silicate, it is better to choose escharotic made from HF.

      2. mineral component
      The mineral component was not only affected by chemical component, also affected by the conditions to form stone, the stone with same chemical component exist different mineral under different physical and chemical conditions. Mineral different, the reaction speed for escharotic are also different. Like molecular formula to be Al2O3, under different conditions, it could change to be red column stone, blue crystal stone, silicon line stone. And there 3 kind of mineral the character exist great difference, their reaction to the escharotic are also quite different.

      3. stone structure
      stone structure is the relationship between the minerals it contains, it include mineral crystal level, grain size, grain shape. Usually if the crystal level is good, the final crystal surface is the bigger surface with high density, this kind of surface’s chemical reaction will be slower.  Therefore, the stone consist of idiomorphism and half idiomorphism mineral, the erode speed is slower. Grain size bigger the erode speed slower, so the grain size affect the erode speed.

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