Re: Here is why my UV print exposures were so erratic...

From: [email protected]
Date: 01/23/04-11:37:08 PM Z
Message-id: <d8.1dacd5b.2d435e84@aol.com>

Was it giving you a nice pattern of the cover paper texture on your final
print?

In a message dated 1/23/04 11:12:09 PM, mklemmer@comcast.net writes:

>
> For the longest time I could never figure out why my kallitype exposures
> were so erratic from print to print.  Sometimes too dark... sometimes too
> light.  I came up with every possible explanation under the sun, but tonight I
> finally figured it out...the real reason. 
>
>  
>
> What I was doing was allow the mercury vapor UV lamp to fully warm for 5+
> minutes while covering up the print in the vacuum frame with heavy stock
> cotton paper.  Well it turns out that the paper I was covering it with is not UV
> opaque!   It was getting significant exposure before the exposure. 
>
>  
>
> So I finally figured it out quite by accident and thought I would share. 
> Fortunately, now I have a working integrator so I won't  have to warm up the
> lamp and time my exposures. 
>
>
Received on Fri Jan 23 23:37:47 2004

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