Thursday
Nov082018

University of Colorado Colorado Springs

We had a good time at UCCS this week. Jeanne and I spent a couple of days at UCCS (University of Colorado Colorado Springs) with Stacy Platt and her 19 students in her Alternative Processes class.

They ALL made a plate! I tried to snap a few of them before we left, but they all did a really good job. I wish my first plate looked as good ;-)

A big thanks to Stacy and the students for having us.

Tuesday
Oct302018

Prototype New Book Cover for 2019 Release

Thursday
Oct252018

The Chemist 1851 - Where It All Began

 

 

Wednesday
Oct102018

THE COLLODIO-ALBUMEN PROCESS 

THE COLLODIO-ALBUMEN PROCESS 

 

Many modifications of this process have been proposed and practiced with more or less success. Mr. Madd, of Manchester, has perhaps, of all operators, been the most successful on large plates. The following is his mode of procedure. Coat the cleaned glass with Bromo-iodized Collodion in the usual way.

 

After allowing the film to set well, sensitize in the ordinary Nitrate of Silver bath. If the Collodion should give a very thick and creamy film, it must be reduced by adding Ether. After sensitizing for the usual time, the plate must be well washed and then placed in a dish containing a weak solution of Iodide of Potassium and water (about one grain to the ounce of water) for two or three minutes, gently moving the dish in the meanwhile. Rinse with tap water and drain a minute. 

 

To the whites of ten eggs add:

50 grains Iodide of Potassium

10 grains Bromide of Potassium

100 minims Liquid Ammonia

2 1/2 ounces Water

 

Dissolve the Iodide and Bromide in the Water, then add the Ammonia.

Mix all together with the Albumen, and beat the whole into a froth. Let it settle until the froth has subsided into the liquid form Filter through muslin into a stock bottle. Decant off a portion, and to the previously washed and still wet film, apply the solution twice. 

 

Now allow the plate to drain for five or ten minutes, then dry it rapidly before a clear bright fire, and make it quite hot. These plates may be kept till required for sensitizing. To re-sensitize the plate, it is only necessary to dip it for one minute into the Aceto-nitrate bath, with Kaolin and filtering makes it again clear; but some operators prefer to pour a little of the Nitrate solution on and off the plate for a few times, and then throw the residue into the waste-silver jar. Plates so prepared will keep in good condition for six or eight weeks in cold weather; but in hot weather it is advisable not to trust to their efficiency for more than a fortnight.

 

They are developed as follows. Take the exposed plate and pass over the surface a little clean water till the film is thoroughly moistened; then take a plain Pyrogallic solution, say two or three grains to the ounce of water, and pour it on the plate. The sky and highlights will appear almost immediately, if the exposure has been rightly timed, and ultimately feeble indication of details.

 

The picture now requires intensity, which is given by the following solution:

Pyrogallic Acid 2 grains

Citrio Acid 2 grains

Nitrate of Silver 2 or 3 drops (20 grain solution)

 

Pour quant. suff . of this on and off the plate until the requisite printing density is obtained. Numerous modifications of this excellent dry process have been devised and worked, but the above may be considered a good starting point for the Photographer to alter according to his tastes.

 

The Negatives should be fixed with Hyposulphite of Soda, because Cyanide of Potassium will always weaken or destroy the semi-organic deposit, just as surely as if the image were a Positive print on paper.

 

Monday
Oct082018

Collodio-Chloride Prints; aka Aristotypes