sfage Posted November 22, 2011 Share #1 Posted November 22, 2011 Advertisement (gone after registration) Owing to my present living situation, I can't develop in my own house. The chemical smell is a problem. I have been taking my negs to someone else but I have noticed that a lot of my Ektar is really, really red (just by simply holding the neg up to the light). Of course, when scanned, it it is quite red and yellow. I have many other rolls of this film that are 'not' red and yellow. Does anyone know what is going on, chemically? Link to post Share on other sites More sharing options...
Advertisement Posted November 22, 2011 Posted November 22, 2011 Hi sfage, Take a look here Negatives (C41) red. I'm sure you'll find what you were looking for!
adan Posted November 23, 2011 Share #2 Posted November 23, 2011 Well, color negs (with a few notable exceptions) always have a red base or background tint. But the few times I've had negs that were redder than normal, it was due to overdevelopment (my thermometer calibration was off, leading to development at 103°F instead of 100°). What goes on chemically is that the red base tint is a mask to compensate for imperfections in the spectral transmission of the image dyes. The mask is produced by the same dye couplers and development as the actual image, so overdevelopment creates more dye in both image and mask, and thus a redder base tint. The only thing I find slightly confusing in your report is that, since color hue is reversed in scanning or printing color negs (e.g. a red shirt appears cyan in a color neg, reversed back to red when scanned or printed), I'd expect negs that are too red themselves to produce scans that are too cyan. That was my result from those overdeveloped negs - heavy cyan casts that were hard to remove. Link to post Share on other sites More sharing options...
gyoung Posted November 23, 2011 Share #3 Posted November 23, 2011 From memory when we ran a dip and dunk machine for the students C41 the mask density varied from one make to another, and betweeen different films from the same manufacturer too. What would be significant is if the mask density was different from one film to another of the same type, and even then there might be changes over time, I doubt emulsion formulation stays exactly the same over the long life of a branded film. Gerry Link to post Share on other sites More sharing options...
sfage Posted November 23, 2011 Author Share #4 Posted November 23, 2011 Gerry, I think this might be the problem. These rolls came from the same sealed package from the store. I was there when they opened them. I've never had this problem before. Generally I find ektar to be excellent and my other negs (I bought months ago) are not like this. I'm thinking it's a bad batch. Link to post Share on other sites More sharing options...
gyoung Posted November 23, 2011 Share #5 Posted November 23, 2011 I would much rather suspect processing variations, assuming that they don't print OK? Gerry Link to post Share on other sites More sharing options...
theendlesshouse Posted November 23, 2011 Share #6 Posted November 23, 2011 Are they very contrasty, what colour are the stripes than run through the sprockets? Link to post Share on other sites More sharing options...
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