Cụ ơi, phát kiến của cụ có thể làm hỏng viên đá một cách từ từ. Các chất tẩy rửa sẽ làm tổn thương vật liệu liên kết các hạt mài, ảnh hưởng đến khả năng ăn thép của đá. Mong cụ đọc kỹ hướng dẫn trước khi sử dụng.
Directions for Use
Immerse the stone in water five to six minutes before use. This markedly reduces the friction when sharpening.
Do not leave the stone too long in the water.
After use, make sure the stone is allowed to dry. If it stays wet too long, or is for instance stored wrapped up in a wet rag, the stone will become too soft to sharpen properly.
Do not leave the stone outside or in direct sunlight.
This prevents cracking and general decomposition of the stone.
Keep the stone from drying out too quickly.
The stone should not be left in a draft, as from a ventilator, heater or air-conditioning unit. This prevents cracks from developing.
Store the stones at room temperature.
If they are exposed to unusually high temperatures, as in a closed car in the sun, the stone can crack or break.
Never allow the stone to come into contact with hot water.
The extreme difference in temperatures can cause the stone to crack.
Never allow the stone to come into contact with detergents or other soaps.
This can damage the binder that holds the grit together and so reduce the stone's ability to sharpen.