Well sorry, I don't know it clearly in English. But it's a 2 layer paper, you can peel the back and stick the other on something. It's like the sticker. I don't know if you use the right word. STICKER.
You usually give up the back layer of sticker. But if you wanna make a pcb, you throw out the front layer (u usually use this layer to stick on something).
The back layer has two side, one is normal side, we won't care of this side, but the smooth and shiny side.
This smooth and shiny side is fixed with the front layer of sticker.
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back layer front layer
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STICKER
dont care about the . dot, because if I don't write the dots, it cannot be viewed right.
Enlarged back layer
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^normal side ^smooth and shiny side
You can print the pcb to the smooth and shiny side ( instead of on normal paper (A4 for example..))
After that, you press this side against the copper board. Of course against the copper side.
You then iron (use the iron to iron as you do with clothing) so that the ink of pcb you printed on smooth and shiny side attaches to the copper board
Then, you dip the copper board in FeCl3 liquid.
FeCl3 + Cu = CuCl2 +FeCl2
Therefore, copper on the board will dissolve in the liquid, except the inked copper parts.
Finally, you have the remaining copper on the board as identical as the pcb you need.
drill the holes for components' pins
>>> you got your pcb