I am not convinced that all regular routes are closed. Turkey is a modern country with a functioning postal system. Istanbul is a massive metropolis. It is possible to obtain catechol there, I'm sure. Or simply ready-made pyrocat. When connecting two dots, a straight line is the shortest way. Start there.
Many sellers are willing to send "samples" - the listing usually states a minimum quantity, which is typically 1 kg. That's how I got CD-3 from Alibaba - three whole kilograms. There was an issue, though, with the fact that I don't have a registered company, in principle they don't sell to end consumers, but in my case they agreed. I was telling them I was "in the process of opening a company", and they were telling me they "believed" me and that there wouldn't be a problem. In the end, I'm happy with the final result of this little "affair"
The supplier is Zhaohui-Chem. Shipping was via FedEx - "fast and easy delivery", which isn't a description I’m familiar with from FedEx, so it may be something specific to China. Shipped on 20.10.2022 (Shushan), it arrived in Bulgaria on 02.11.2022 (there was a delay due to customs clearance).
The shipping cost and VAT were included in the total price ($120/kg).
Are you trying to make slides from B&W film? A staining developer is not a good idea for use as the first developer in reversal processing of B&W film. Use a paper strength developer like Ilford PQ Universal or its substitutes.
Yes, it's a bad idea as the first developer. However, as a second developer, a staining developer like Pyrocat HD can be useful.
We have D76 and Ilford Multigrade Paper developer , Yes I am trying to make 6X24 Slides from BW 120 roll film.
Do you think that it may also work with Multigrade developer?There's a first developer for reversal processing of TMax films proposed by Dietrich and sold by Photographic Formulary based on D76. Dietrich's idea was to add Sodium Carbonate to make the developer more active and use Sodium Thiosulphate as the halide solvent. So, if you have D76, you can make a decent first developer by adding suitable amount of Sodium Carboniate and Sodium Thiosulphate. Though designed primarily for TMax films, you should be able to use it for other films as well by fine tuning the amount of Sodium Thiosulphate and the development time.
As far as reversal processing of B&W films is concerned, it is best to start with a tested process rather than experimenting with esoteric developers.
Tannic acid would likely stain the gelatin emulsion. Whether or not it will effectively develop film to a desirable result, and under which conditions, would take a lot of experimentation to figure out. Due to its tendency to stain pretty much everything it comes into contact with, it would not be very suitable for development of slides/reversal processing. The tanning effect might also hold back development of the denser areas, which can result in poor blacks. For reversal processing, I'd stick to a normal, non-staining developer for both first and second development. If desired, the film can always be toned afterwards with any toner that would work on silver, such as sepia, selenium, gold etc.
Furthermore, as far as I know, tannic acid is a poorly characterized substance that can be highly variable in composition. This would exacerbate the problems above as a formula that works one day (after lots of testing) may not work quite as well at a later stage when you happen to have a different batch of tannic acid as a raw material.
I don't know how strict customs are in Turkey; it would be nice if your Pyrocat makes it through.
Turkish Customs want to ordinary people stop wasting dollar euro to abroad. They do everything to stop it.
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