Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Mike Young" <mikewhy@...> wrote:
>
> So, I carelessly placed an order for a toner cartridge. It wasn't until 
> after completing the order that it finally dawned that "MICR" wasn't a 
> random acronym. It stands for Magnetic Ink Character Recognition, the funny 
> characters printed at the bottoms of bank checks. Apparently, I'll shortly 
> be able to print my own check stock.
> 
> Does anyone know what benefit MICR toner might have for toner transfer use 
> in making circuit boards?
>


MICR toner has a minimum amount of magnetic material in with the toner so that the printed text can be sensed with a magnetic pickup.

That magnetic material can be any one of several ferris metals, so I could guess that it will make the toner more likly to etch away when you want it to stay and the exposed board to etch away.

I would be very interested to hear your results.


--
James.
http://techref.massmind.org/techref/pcbs.htm