[alt-photo] Re: odd tintype observation

[John Brewer]

>I've had a couple of workshop students do the same thing with collodion.
>They get too excited and forget to peel the plastic.

Hmmm, I think I was one of them Kerik. I was devastated when I took a fab
portrait of your daughter Sarah only to find I had left the film on. The
subsequent image was no where near as nice. Well we live and learn I
suppose.

J.
On 23 November 2010 17:27, Kerik <kerik at kerik.com> wrote:

> Christina,
>
> I've had a couple of workshop students do the same thing with collodion.
> They get too excited and forget to peel the plastic.
>
> The trophy plate aluminum that Main Trophy sells is not anodized. It is
> coated with a gloss enamel paint (according to the sales guy I deal with
> there). Anodizing usually leaves a satiny finish rather than glossy. That
> said, collodion sticks to the painted aluminum VERY well. Much moreso than
> to glass.
>
> Kerik
> www.kerik.com
>
>
> > John, I've been scouring! WIth a heavy duty scour brush. But, come to
> > think of it, I haven't used my trusty Scotch Brite scouring pad that I
> use
> > for gum so you reminded me! Out with the arsenal.
> >
> > I was going to have to take out the steel wool but didn't want to mess up
> > the metal plates.
> >
> > Etienne, it is definitely as you say, below, anodized, then, not painted.
> > I wouldn't know my aluminum from my silver even if my father was a
> > metallurgist...
> > Chris
> >
> > Christina Z. Anderson
> > christinaZanderson.com
> >
> > On Nov 23, 2010, at 3:38 AM, John Brewer wrote:
> >
> >> 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
>
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