Toner transfer paper is a method of making PCBs at home.
You can buy special paper for making PCBs. I was wondering if it was possible to make your own toner transfer paper. It turns out you can. The key point about these types of paper is that they are coated with a water soluble coating that makes it easy to remove the paper from the PCB after you have heat fused the paper to the PCB. I used regular copy paper or onion skin paper and coated it with dextrin (vegetable based glue, similar to the stuff that is on the back of stamps and envelopes). The dextrin is made from corn starch.
Making the dextrin
Coating the paper with dextrin
Using the toner transfer paper for etching
I am using one of my projects as an example. Just as reference most of the traces on this PCB are 40mil, 80mil, or 100mil.
For more information about etching chemistry take a look at this link.
http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html