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I am new to UV etching. I have a 2 layer PCB layout that I prepared on Eagle Cad. I am confused what layer do I need to mirror?

After printing the layout what side of the paper turns to the UV light and to the board (for both top and bottom layers)?

Edit: I use Jetstar inkjet film (transparent) and I will use ink printer (HP). I will use UV box to transfer the layout onto the PCB.

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  • \$\begingroup\$ Paper? Not transparencies? \$\endgroup\$ Commented Sep 27, 2013 at 14:06
  • \$\begingroup\$ What method are you using? Toner transfer? \$\endgroup\$
    – user36129
    Commented Sep 27, 2013 at 14:37
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    \$\begingroup\$ You can reason this out for yourself: the toner must be pressed against the copper, hence the bottom side must be 'true', and the top side must be 'inverted'. BUT if you have never done this before I suggest you start with a 1-sided pcb! \$\endgroup\$ Commented Sep 27, 2013 at 14:52

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You want to have printed ink as close to the PCB surface as possible. In order to do so you need to mirror the top layer.

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