This section is from the "Studio Light Incorporating The Aristo Eagle - The Artura Bulletin 1912" book, by Aristo Motto. Also see Amazon: Studio Light Incorporating The Aristo Eagle - The Artura Bulletin 1912.
Since first publishing the Artura- Method Sepia formula, we have made a series of experiments and have had one of our special representatives make a trip from the Atlantic to the Pacific for the purpose of testing out this formula under various conditions. As a result of these experiments we are giving below a revised formula.
We found that in order toadapt it to the various conditions under which it was tried out, a slight variation was necessary in the amount of hypo to be used. That there may be less chance for errors, more explicit instructions also are given for the compounding of chemicals. When prepared in accordance with the following instructions, we find that the length of time necessary for toning prints has been materially shortened. This we believe will be appreciated by those using this method of making Artura Sepias. The revised formula is as follows:
Develop in the regular way.
Fix in the regular way.
Wash the black prints for a few minutes to eliminate the acid from fixing bath.
Tone in following.
Boiling water (rain or distilled), . 128 ozs.
Alum........... 2 ozs.
Boil two minutes, allow to cool, then add
Sodium Phosphate,......2 ozs.
At this point test the bath with red litmus. Same should turn blue within one minute. If it does not, heat the bath again and add Hypo in 4-oz. quantities until it does. When a slightly alkaline bath is obtained dissolve
Nitrate of Silver........60 grs
Bromide of Potassium.....l80 grs
Pour Bromide solution into Silver solution and add precipitate and all to the cool Hypo-Alum bath. If Silver and Bromide are added to bath while hot, same will turn dark.
Chloride of Gold........15 grs.
When ready to tone take as many ounces of bath as necessary for the number of prints and add 1 dr. of Gold (No. 2) to each 16 ozs. of Hvpo-Alum bath (No. 1).
One gallon of bath (128 oz.) will tone 1 gross cabinet or 4x6 prints or the equivalent in other sizes. It is advisable to use fresh bath when this number of prints have been toned rather than attempt to renew its strength by the addition of gold.
For a small batch of prints prepare a.small bath. Preserve the same proportion of chemicals as advised in the above formula.
The entire lot of prints should be placed in the bath at one time, keeping them well separated during the process of toning.
Tone at 120° to 125° Fahrenheit.
Do not begin toning at a lower temperature than 120 degrees.
Time of toning should be about 20 minutes.
It is necessary to have the water at boiling point when the hypo and alum are being mixed. The other ingredients must be added at lower temperature.
The toning bath should be slightly alkaline. This can be determined by testing with litmus paper.
If the bath is too cold the gold tone will predominate; if too hot, the sulphur tone will predominate.
To determine when the prints have been toned, examine by transmitted light, and when all black has been removed from the deepest shadows it is safe to assume that the final color has been attained.
Sponge prints to remove any sediment.
RETURN prints for five minutes in regular fixing bath.
WASH in the regular way.