Homebrew PCBs

On 24/05/13 09:00, cunningfellow wrote:
>> Russell Shaw wrote:
>>
>>
>> I think the gelatine coating only absorbs
>> and quickly dries with dye ink.
>>
>> The i865 has both pigment and dye ink black
>> tanks, though the aftermarket cheap replacement
>> for the pigment tank is usually a dye one too.
>> The colour tanks are all dye.
>>
>> When printing with text, the pigment tank is
>> used. Pigment ink stays wet on the gelatine
>> surface because the ink is oil/wax based to be
>> waterproof. The gelatine only absorbs water,
>> and dye inks are more "watery" based.
>>
>> <SNIP URLS>
>>
>> A pigment ink gets its colour from the colour
>> of the suspended solids. They usually fade
>> less in UV light.
>>
>> A dye ink has no solids. The colour comes from
>> the liquid. They usually break down and fade
>> more in UV light (i can't say for certain about
>> modern formulations though).
>
> I think (but am not sure) that my phototool
> printing is being done with the BC-3 (pigment)
> cart.
>
> The print was told to do "B&W only"
>
> I will try do some tests making sure different
> carts are used to see.
>
> BTW - the ink DOES stay "wet" for a long time on
> the gelatine surface.  However after the oven
> treatment it does not "pool" when wet so makes
> nice solid dark (temporarily wet) blacks.

Ok, sounds like pigment.

Using genuine Epson dye ink on my old stock of epson gelatine transparencies, 
the ink is instantly absorbed and dry.

> I have read that yellow ink is sometimes more
> UV blocking than black because of anti-fade
> UV blockers used.  I have not tried this myself
> yet.