Adox FX-39 II Film Developer is a one-shot developer for especially detail-rich and extremely sharp negatives. This developer is based on the Beutler Formula for Neofin Red, but was further developed by Geoffrey Crawley. It makes very good use of the film's full ISO-rating, making it possible to double the film speed by adjusting the development times. FX-39 can be used in various dilutions in order to develop low-sensitivity films with at least 6 minutes developing time. Especially good for films up to 200 ISO.
Standard dilution: 1+9. Can also be used at 1+14 (multiply dev time x1.5) or 1+19 (multiply dev time x2).