Unicolor cube

Paul Howell · May 30, 2020

Yesterday I hunted through my storage locker and found my old Unicolor Cube, seems I have the cube, the diffuser, and exposure chart, but could not find the directions. Last time I used this was in the late 70s or early 80s. I did find a link to the file, a PDF file somewhere here on PHOTORIO, could could not print as my printer is down and no one has one in my area has a inkjet in stock, , this morning could not find it again. Anyone have a link?

MattKing · May 30, 2020

Do you still have the link?

Paul Howell · May 30, 2020

Cant find it. I searched PHOTORIO but could not find it. I will need to look at my search history.

Paul Howell · May 30, 2020

Found it, it's Duocube, not color cube.

cmacd123 · May 30, 2020

Is it not make a test print with target negative and the diffuser, and look for the neutral grey square, that will give you the filter changes you need.

glbeas · May 30, 2020

Yep. Theres supposed to be a grey target with a hole in it to compare for the grey spot. Then you look at the chart that comes with it to find the filters to add or subtract. I had a color reflection densitometer at the time and managed to use it by finding the spot where all three colors were equal.

Paul Howell · May 30, 2020

I read the direction for the Duocube, I have the Unicube, a single cube, I think the principle is the same, some of it coming back to me. In the end was just too much trouble, made a couple of test prints, have what I think is really strange filter pack, 05 M, 35 Y, My test prints are all good, next time I'll confirm then progaam my Omega analyzer, then dig in my negative file for negatives dating from the 60s or early 70s to see how well the analyzer does in getting me in the ball park. Then same procedure for the D3 with a filter pack and a 6X9 negative.

mshchem · May 31, 2020

I think the Duocube was for negative AND a second set for Reversal printing. I've got a Unicube some where.

Color printing old school, for me means making ring around prints and 5500°K light source.

I had a chance to get a genuine Macbeth light booth, thing was 4 feet wide. Had 3 or 4 illuminants, we used it for color matching appliance parts. I think it got scrapped.

mklw1954 · Jun 10, 2020

I had a Duocube but didn't see the need once times and color balances are established for your enlarger, film, and film and print developing methods and controls.

Some interesting color development historical info:
https://www.photomemorabilia.co.uk/

Paul Howell · Jun 10, 2020

What I have found out, with modern film and R4 paper, very consistent from frame to frame, even box of paper to box of paper, now that I have calibrated my analyser with a good reference negative will see what happens when I print C22, 3M, Afga, GAF negatives that are now over 40 years old.

Unicolor cube

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