Do Delta films dry faster?

[Rayt]

I only shoot Fuji and Kodak films because I am used to them. I tend to stick with a few tried and true film and developer combinations. I bought some Delta 3200 in 120 to try out a few years back but never had a use for them. I shot a few rolls yesterday at 800 because I wanted to use them up. I also shot some Tri-x at 800, process them together in HC-110 B because they were the same times. I hung them up to air dry and after three hours the Delta was completely dry and I could easily slide the negs into the Printfile page easily. However the Tri-X was still wet and limp, the emulsion side soft and sticky. Is this a feature of Delta films? A fast drying film would attract less dust so this would be interesting to me if true.

 

[Fotohuis]

The speed of drying depends on the type of film: Polyester or Tri-Acetate, the temperature and the humidity.

Depending how fast a film is drying and the type of wetting agent it curls more.
In this way there is also a difference in film material: Polyester curls more then Tri-Acetate. And how effective the non-curling layer has been made.

If you want high speed drying of your film you can use Rapidry, based on 70% IPA (Iso Propyl Alcohol). The film is drying in about 5 minutes.

 

[Happy_french_chemist]

If you want high speed drying of your film you can use Rapidry, based on 70% IPA (Iso Propyl Alcohol). The film is drying in about 5 minutes.

Reporters in a hurry to have an image were using pure alcohol (ethanol) but it can do damage to the film emulsion (cracking).

 

[Fotohuis]

Yes, some emulsions can swell more then in water, so there can be a possibility of damage.

 

[Happy_french_chemist]

Yes, some emulsions can swell more then in water, so there can be a possibility of damage.

I fear it is the oposite : gelatin is soluble in water but not soluble at all in ethanol. When a gelatin containing water is placed in enthanol, water has to be in equilibrium in both phases, gelatin and ethanol. So it is sucked out with cause a quick shrinkage of the gel which can cause a rupture (osmotic shock).

 

[Happy_french_chemist]

The speed of drying depends on the type of film: Polyester or Tri-Acetate, the temperature and the humidity..

Water is more mobile in a swollen gel of gelatin than through a rigid polymer layer : it evaporates from the gelatin but not through the plastic support.

What makes the difference, at given athmospheric properties (temprature, pressure, hygrometric degree) is the type of gelatin used (it consist in very long molecules forming a network very tight or loose. So it let water going in and out more or less easily) and the thickness of emulsion laid or sprayed.

I think the thickness is given, but not the gelatin type..



ADD :

it is only the thickness of the support which is given in the technical doc 🙁 Both have an acetate support (0,13 mm for Tri-X and 0,11 for Delta 100 according to :

http://www.google.fr/url?sa=t&rct=j...sg=AFQjCNGcKMsn3J4yXrOu9TJDSpyxCihRnA&cad=rja

http://35mm-compact.com/pdf/ilford-delta-100.pdf

 

[Fotohuis]

35mm is normally on 135 um while roll film is around 100um. Sheet film often 175um.

Ilford and Kodak are using Tri-Acetate. Foma on 35mm too and on roll film Polyester while Efke and Rollei is using Polyester too on all formats.
Only not the RPX (Rollei films) but their emulsion is again from Ilford.