Gas / Nitrogen Burst Development?

[Photo Engineer]

Ours were custom made in our shop. They were never sold.

I think what your reference shows would be nice. You would have to use some sort of initial agitation as you do with even the normal sparger.

The frits would be difficult to fit IMHO.

PE

 

[Stefanie Khan]

The Refremas are in a complete league of their own. Terry Khan spent his whole career going from lab to lab in NA and beyond adjusting the burst systems to get even flow.
ND tests would be done on E6 film , basically neutral lit gray backgrounds and then processed on a full rack which would hold 6-10 4x5 at a time.
Terry's drill would be to evenly match the density on four corners , middle , top and bottom.
Colourgenics in Toronto would bring him in for tune ups on their machine and were cherished by commercial shooters who needed even and consistent development.
The burst was adjusted top to bottom side to side to even out the agitation in the larger tank.
Burst from the bottom in smaller tanks only will agitate the film but certainly not even as suggested by some here.

I believe you're referring to my Dad, Terry Khan. Although this is an older post, I'm both happy and proud to see that he made an impact on the industry. Cheers!

 

[Bob Carnie]

Hi Stefanie

Small world - I met your Dad at Colourgenics in the late 80's - he was responsible for making their Refrema ranked number 1 in North America for two years standing by Fuji testing done back then.
The best labs would hire your dad to come in and do film tests with grey cards up and down a full rack , he would match the inside outside top and bottom in density by adjusting the flow to the tanks. Bit of a celebrity in the Lab world back then, I hope he is well, are you into photography?

Bob

Bob

I believe you're referring to my Dad, Terry Khan. Although this is an older post, I'm both happy and proud to see that he made an impact on the industry. Cheers!

 

[blindpig]

Hi Stefanie

Small world - I met your Dad at Colourgenics in the late 80's - he was responsible for making their Refrema ranked number 1 in North America for two years standing by Fuji testing done back then.
The best labs would hire your dad to come in and do film tests with grey cards up and down a full rack , he would match the inside outside top and bottom in density by adjusting the flow to the tanks. Bit of a celebrity in the Lab world back then, I hope he is well, are you into photography?

Bob

I'd have to agree with Bob,Stefanie if your dad could keep the Refrema under control as Bob described he'd have to be a genius. The good thing about Refremas is the combination of burst and dip and dunk together, which when working well were beautiful.I started my journey with nitrogen burst using Kodak hard rubber tanks and a plenum attached to the bottom of a basket full of film holders,processing E3 transparencies.This system was used for some time but didn't produce the even development the company I worked for desired.Later we switched to E6 film and had custom built stainless steel tanks with the plenums attached in the bottom further down away from the basket allowing better evenness of development.Our problem seemed to be uneven agitation from the top to bottom of the film caused by the proximity of the plenum to the lower part of the basket.As the bubbles exited the plenum they were small and propelled strongly by the gas then slowed and expanded as the rose up the tank,causing uneven agitation.Eventually we acquired a Refrema and it solved a lot of our issues plus it's replenishment system was great as well.
Don

 

[mrred]

https://www.tedpella.com/photo_html/photo5.htm

 

[Ronald Moravec]

I would suggest you price tanks, regulators, and the cost of having tanks inspected . Every few years they must be reinspected by federal regulation . Cost of filling is probably fairly cheap. Air is 80% Nitrogen. I gave up and bought an air compressor for my air brushes.

If you are having trouble with marks, the cure is faster agitation, not slower. I go in & out 6 times first 30 seconds. All the drain hole marks go away.

Arkay made a hangar rack for me ten/15 years ago. Holds 8 4x5 in a cage which makes them very easy to hold, do not hit each other, and one handle does everything. Holding 4 or more in your hand is near impossible.

 

[Stephen Frizza]

I have been working with Nitrogen burst processing in TECNOLAB dip and dunk machines for 16 years now and processed well over a million rolls with this method. I would recommend no other means above it for commercial film processing. If anyone has any questions on technical aspects of Nitrogen burst development I'm happy to answer questions. There is a great art to size of nitrogen bubbles, speed of rise, humidity of the gas, duration of agitation etc...

 

[juan]

Is anyone using the Inglis system for 8x10? I have a problem with the film moving within the Inglis 4-sheet holder. The negatives touch during processing and are ruined. I do have the weighted flaps that fold over the top, but they don't sufficiently hold down the film. Does anyone have a suggestion?

 

[MattKing]

Is anyone using the Inglis system for 8x10? I have a problem with the film moving within the Inglis 4-sheet holder. The negatives touch during processing and are ruined. I do have the weighted flaps that fold over the top, but they don't sufficiently hold down the film. Does anyone have a suggestion?

What does Alastair Inglis have to say?
Dead Link Removed

 

[juan]

He's away for a month.