[alt-photo] Re: odd tintype observation

[John Brewer]

Just use a scourer Chris. Every gummist has a scourer in their arsenal don't
they?

J.

On 23 November 2010 05:13, etienne garbaux <photographeur at nerdshack.com>wrote:

> Christina wrote:
>
>  I got the trophy metal plates (black painted aluminum) from a trophy store
>>
>
> I can't comment about the particular plates you got, but aluminum engraving
> plates are generally anodized (anodizing is an electrolytic oxidizing
> process).  The oxide layer is dyed black (or yellow, blue, red, etc.).  It
> is a bonded (not applied) finish.  It is almost always given a hydrophobic
> sealing as the last process step, to improve environmental resistance.
>  Before it is sealed, anodizing is quite porous and holds many kinds of
> coatings well.
>
> Best regards,
>
> etienne
>
>
>
>
>
>
>
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo
>