Digital BW, The Print

Paul Roark wrote:

>  
>
>>I is very important to use an ink that will not fade. Most of these 
>>pens that you can pick up in office supply stored will fade ...
>>    
>>
>
>In my fade tests the pen markings usually disappear quickly.  They must be
>dyes.
>
>Paul
>www.PaulRoark.com 
>
>  
>
With the exception of the Lumocolor fibre tip pens made by Staedtler.  
Not only are they more fade resistant but their chemical resistance 
seems to be high enough to use them as an etch resist in PCB etching. 
The choice of colors is limited though. The "permanent" Lumocolor is the 
type you need.

http://www.opusframing.com/sales/pdf/drawing_pen_ink.pdf

Ernst