To prepare the solution needed three parts water to one part ferric chloride is sold in powder form. The mixture should not be cooked in a metal pot, as it easily dissolves metal.
In the absence of ferric chloride can be used bluestone. Preparation : 1 teaspoon of copper sulfate + two tablespoons of white salt per 100g. water. The duration of etching using the mixture to 1 day. In this solution repairs itself unlike iron chloride. Consumable substance in it is salt. Bluestone sold in stores " Gardening ". Used in home gardens for pest control.
Known and such Recipe for solution . In one liter of cold water was dissolved 20 -25 gidroperita tablets, and then carefully add 100 ml of concentrated sulfuric acid. Such a solution pretty quickly corrodes fee. gidroperit can be purchased in a pharmacy pills.