The traditional etchant for copper is Ferric Chloride, but a cheap and very good alternative is a mixture of Hydrogen Chloride (HCl) and Hydrogen Peroxide (H 2O 2).
A toothbrush or similar semi-soft brush.Some people say that steel wool may contaminate the copper, but others have used it without problems. A kind of abrasive sponge, like a scotchbrite pad, or steel wool.A laser printer with ordinary toner, 600dpi is recommended.However, this paper is pretty expensive and hard to get outside the US.
The method can also be extended to produce decals that will stick to about any surface, even curved. The result is a very clean transfer that can also be used to transfer colour laser prints onto various surfaces. The toner sticks to this coating, which dissolves completely when soaked in water. Some companies like PulsarProFX produce special toner-transfer paper which has a kind of sugar-based coating. A type of paper, coated with a thin wax-like layer on one side, and easily dissolvable in water.If you only have boards with such a layer, you need to remove it first with a solvent like acetone. A blank PCB, without a photoresist layer.
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