Fine Grain Equalizing Developer
Silberra Micro-F is a single-solution fine grain film developer. Silberra Micro-F allows to increase sensitivity of emulsion up to 8-10 times while saving wide tonal range and deep clear blacks. Lowers fog level and graininess of negatives. Micro-F is one of the best developers for push processing, being very close to famous Microphen developer in every aspect.
Chemical Composition
Boric acid, potassium bromide, 1-Phenyl-3-pyrazolidone, sodium sulfite anhydrous , hydroquinone, borax, disodium edetate
Preparing Working Solution
Working solution is prepared by pouring the contents of the packs into water while continuously stirring the solution (use glass stick or special plastic stirring stick for chemicals). Distilled or filtered water is strongly recommended.
The method of preparation is as follows:
1) Warm 700-800 ml of distilled water up to 55-60 Celcium degrees (use mix of hot and cold water, or use microwave to warm up the water).
2) Pour contents of pack #1 into the water while stirring until the powder is completely dissolved.
3) Pour contents of pack #2 into the water while stirring until the powder is completely dissolved.
Do not begin mixing the contents of pack two until pack one is completely dissolved. If any lumps of powder form in your solution, they can be broken down with your stirring stick. As soon as the working solution is ready (powders are totally dissolved), add cold water to make up to 1 litre and stir.
Allow the solution to cool to room temperature, nominally 20-22 C. The solution will be ready 3-4 hours later. Filtering the solution is not obligatory but recommended option.
Development Times
Silberra Micro-F Developer working solution works better for nominal sensitivity of silms when it is diluted to a ratio of 1:1 (one part of working solution and one part of distilled water). Pure Silberra Micro-F working solution is more suitable for push processing. Optimal time to process specific films is stated either by manufacturer of the film or can be learned from the table of developing times at this page (the table is being constantly updated).
Usage Limits
Silberra U-2M working solution’s effective usage limit is 7-8 films of 135/36 type or 3-4 films of 120 type per 1 litre.
Side Effects
While using this developer you should remember to subject to increase in processing time of 10% for each film after the first.
Storage
Keep Silberra Micro-F Developer in a cool, dry and dark place. Keep away from children. It is optimal to store your working solution in opaque, chemically inert and tightly sealed containers with minimal air space in order to reduce oxidation.
Expiry Date / Shelf Life
Silberra Micro-F sealed powder packs can be stored up to 12 months past the production date. Silberra Micro-F Developer working solution can be stored for 1 month past the production date (in a tightly sealed bottle). Please note: partly used developer can not be stored.
Disposal regulations
Silberra developers and fixers must be disposed of in accordance with the rules and regulations of the country they are used in. Concentrated developers could be toxic and may harm the environment unless disposed in appropriate manner. Silberra recommends to use special disposal services provided by correspondingly licensed organizations which are eligible for photographic chemistry recycling/disposal.
Development Times Table
| Developer | Film | ISO | Time, minutes | Temperature |
|---|---|---|---|---|
| Micro-F | Adox Silvermax | 100 | 9 | 20C |
| Micro-F | Adox CHS 25 | 25 | 5 | 20C |
| Micro-F | Adox CHM 125 | 125 | 8 | 20C |
| Micro-F | Adox CHM 400 | 400 | 6.5 | 20C |
| Micro-F | AgfaPhoto APX 100 | 100 | 8.5 | 20C |
| Micro-F | AgfaPhoto APX 400 | 400 | 8 | 20C |
| Micro-F | Arista EDU Ultra 100 | 100 | 5-7 | 20C |
| Micro-F | Arista EDU Ultra 200 | 200 | 5-6 | 20C |
| Micro-F | Arista EDU Ultra 400 | 400 | 8-9 | 20C |
| Micro-F | Foma Retropan 320 | 320 | 10-11 | 20C |
| Micro-F | Fomapan 100 | 100 | 5-7 | 20C |
| Micro-F | Fomapan 200 | 200 | 5-6 | 20C |
| Micro-F | Fomapan 400 | 400 | 8-9 | 20C |
| Micro-F | Fuji Neopan 100 Acros | 100 | 8 | 20C |
| Micro-F | Fuji Neopan 400 | 400 | 4.5 | 20C |
| Micro-F | Fuji Neopan 1600 | 1600 | 3.25 | 20C |
| Micro-F | Holga 400 | 400 | 8-9 | 20C |
| Micro-F | Ilford Delta 100 Pro | 100 | 6.5 | 20C |
| Micro-F | Ilford Delta 3200 Pro | 3200 | 9 | 20C |
| Micro-F | Ilford Delta 400 Pro | 400 | 6.5 | 20C |
| Micro-F | Ilford FP4+ | 125 | 8 | 20C |
| Micro-F | Ilford HP5+ | 400 | 6.5 | 20C |
| Micro-F | Ilford Pan 100 | 100 | 7 | 20C |
| Micro-F | Ilford SFX 200 | 200 | 8.5 | 20C |
| Micro-F | Ilford Pan 400 | 400 | 6 | 20C |
| Micro-F | Kentmere 100 | 100 | 8.5 | 20C |
| Micro-F | Kentmere 400 | 400 | 8 | 20C |
| Micro-F | Kodak TMax P3200 | 3200 | 12 | 20C |
| Micro-F | Rollei Infrared IR400 | 400 | 7.5 | 20C |
| Micro-F | Rollei Retro 80S | 80 | 9 | 20C |
| Micro-F | Rollei Retro 100 | 100 | 9 | 20C |
| Micro-F | Rollei RPX 100 | 100 | 9 | 20C |
| Micro-F | Rollei Retro 400S | 400 | 9 | 20C |
| Micro-F | Rollei RPX 400 | 400 | 7 | 20C |
| Micro-F | Svema 100 | 100 | 7.5 | 20C |
Push-process time multiplier:
1 stop = x1,4
2 stops = x1,85
3 stops = x2,5
Kodak TMax films:
1 stop = standard time
2 stops = x1,33
3 stops = x1.66