[Controlcambios-list] Er of times of enlargement, but complicated calculations

[Toppings]

 tray of water, on which we place face down a sheet of bromide paper.
The two are removed together and squeezed lightly into contact to remove
air bubbles. The back of the negative is then wiped to remove
superfluous water, and an exposure of several times the normal given,
preferably the normal exposure at half the standard distance from the
light. The paper is then removed and developed as usual. In this way it
is possible to show a print in fifteen or twenty minutes after the
exposure of the plate was made. The purpose of the rinsing before
development is to avoid the possibility of air-bells. The paper should
be rinsed in cold water, as warmish water will cause air-bells instead
of preventing them. This rinsin
-------------- next part --------------
A non-text attachment was scrubbed...
Name: transude.jpg
Type: image/jpeg
Size: 9762 bytes
Desc: not available
Url : /pipermail/controlcambios-list/attachments/20090829/d5c758cc/transude.jpg