You need to cure (Bake) the ink and not simply dry it. Search for earlier posts with the word "Cure". ST describes MISPRo Yellow darkening and hard to get off when sufficient curing has been achieved.
Tamseel Kotawdekar wrote:
> I have successfuly modified an EPSON R310 Printer for Printing onto PCBs.
> It Prints really beautifully.
> I m using EPSON Durabrite INKs which are famous for its water-proof printing
> quality.
> ∗Now my problem is, it does not last until the complete PCB is etched.∗
> ∗Its resists for some time, I can say for about 5-10 mins and then gets
> washed off. ∗
> The Procedure I follow is:
> 1. Clean PCB with Acetone
> 2. Strach it with a sand Paper.
> 3. Print it in Printer.
> 4. Heat it up with Iron.
> 5. Put it for etching.
> I m using ferric chloride for etching PCBs.
> Also I make sure I put PCB for etching only when INKs are completely dry on
> PCB.
> Please help
>
> --
> Have A Nice Day
> (¨`·.·´¨) Always
> `·.¸(¨`·.·´¨) Keep
> (¨`·.·´¨)..·´ Smiling!
> `·.¸.·´
> --Tamseel--
>
>
> [Non-text portions of this message have been removed]
>