Magenta/purple cast affect prints?

[Sim2]

Hi there - odd one this,

If a neg has a magenta/purple(ish) cast to it, can this affect the print - i.e. might this induce/exagerate a blue tone/tinge on multigrade fibre paper?

I realise that this might be totally obvious or sound very wierd however... I had a set of recent negs that when printed with multigrade fibre paper exhibited a blueish tinge most noticeable in areas just up from black to midtone. Having chased around the issue for a while with the same (constant) neg I decided to run the same set of test on a different neg. Chose one with a good set of midtone greys. Straight away I noticed that this neg had a very clear base compared to the first neg which in comparison showed a magenta/purple(ish) cast. Didn't think much of this until the print (using the same papers/chemical/times) showed clean midtones i.e. neutral grey comp-ared to the blue(ish) tinge.

Could the magenta/purple cast be causing the blue(ish) tinge? If so, why?

What causes the magenta/purple cast?

Following on, is it possible to remove the magenta/purple cast now - after the negs have been stored etc?

The only difference I can remember between the two film processes is that I used to presoak the FP4 in water that removed a colour dye (anti-halation layer?) and the recent film development has followed Ilford advice not to presoak FP4.

Any thoughts/questions welcomed, as are definitive answers!

Thanks for getting this far,

Sim2.

 

[paul ron]

Interesting question but for some reason we still get beautiful prints regardless. Maybe we're already compensating for it using the VC filters?

Perhaps an experiment is in order? Expose your paper with a clear no tint negative n one with the tint n see if it makes any difference in contrast? You may be on to something.

.

 

[Jim Noel]

Greg is correct. Check your chemistry and the age of your paper.

 

[pentaxuser]

I might have got your thread on this magenta/purple cast mixed up with someone else's but didn't Simon Galley suggest that you sent the offending chemicals or whatever back to Harman for a check?

If so it is worth doing this.

pentaxuser

 

[Sim2]

Hi there,

Pentaxuser - Yep, you are right Simon Galley has suggested I return the items for checking.

Greg Davis - That is my assumption as well.

I am assured that the issue would be investigated thoroughly by Ilford however I am mindful that this would entail the use of resources to investigate - I have approached this from the point of view that my process is at fault, not the materials. Trying to eliminate and/or identify the cause or likely cause is slightly frustrating but mildly interesting and if I were to involve Ilford might help in pointing the direction of my issue.

I have this issue from a set of negs (1). In comparison I chose a neg (2) of a different subject that had the grey values that have illustrated the tinge - this printed without any tinge. Same papers, chemicals, printing session etc. On inspection the neg 2 was clear whilst neg 1 showed a magenta tinge. I find this really difficult to get my head around but apart from the subject matter on the negs, one prints clean one blue tinge.

Probably gonna juk the set and walk off confused.

Sim2.

 

[MattKing]

It isn't the negatives affecting your paper's tone - unless you have accidentally slipped some colour emulsion material into the paper.

The colour cast on the negatives might be affecting the contrast, which might reveal a problem with the paper that different contrast tends to hide.

 

[Sim2]

MattKing - thanks for that. A cast altering the contrast is a definate possibility and as you say that revealing an issue otherwise hidden makes some sense. Just to clarify, I never thought that the colour of the neg was being replicated on the paper! It is just, at this stage, that this (apart from the different subjects) is the only difference between the negs. Thanks for the reply, always good to have a different head considering an issue!

 

[Simon R Galley]

A mild colour caste in a negative could not really affect contrast in a VC paper to any great degree, also NOTHING in the negative at all could ever be reflected in a colour caste in the paper, monochrome papers are only black and white.

Send us the chemistry to test, yes it takes resource, but we are an ISO registered company, who have to have this process and when you buy our products you are entitled to that resource as you are entitled to an answer.

Simon ILFORD Photo / HARMAN technology LImited :