The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Platinotype
then add 7 ozs. methylated spirit, and allow to cool. The fol-lowing are Pizzighelli and Hubl's formulae for sensitising the paper: -
Solution of Ferric Oxalate
Ferric oxalate ............    120 grs.
Distilled water ............        1 oz.
Oxalic acid...............        8 grs.
No actinic light must be allowed to gain access to this solution. or the ferric will be reduced to ferrous salt.
Solution for Increasing Contrast. Solution of ferric oxalate ... ... ... 1 oz.
Chlorate of potash............ 2 grs.
The same care must be exercised in the keeping of this as of the former solution.
Solution of Chloro-Platinite of Potassium.
Chloro-platinite of potassium ...... 80 grs.
Distilled water ...... ...... 1 oz.
Sensitising Solutions. No. 1.
Sol. chloro-plat. of potassium ...... 24 drms.
.. ferric oxalate ... ... ... ... 22 ..
Distilled water ......... ... 4 ,,
A normal solution, working well and giving deep blacks.
No. 2.
Sol. chloro-plat. potass.......        ...      24 drms.
,, ferric oxalate ... ... ...        ...      18 ,,
Sol. chlorate potash (contrast sol.)          ... 4 ,,
Distilled water ... ... ...        ... 4 ..
This gives brilliant prints.
No. 3. Sol. chloro-plat. potass. ... ... ... 24 drms.
.. pot. chlor. (contrast sol.) ...... 4 »»
Distilled water ......... ... 4 »>
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