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Overview Technical Details Product Line
What is the silver content of Varycon FB and RC emulsions in grams per square meter?
On average, there are about 2 grams of silver in every square meter of paper.

What is the thickness of Varycon FB and RC papers?
FB is 320gsm in thickness, and RC is 250gsm in thickness

Which safelights do you recommend for Varycon papers?
A standard red safelight must be used. OC safelights or a combination of red and OC safelights may result in fogging. Please do a safelight test for your own darkroom environment.

What do the different codes for your papers indicate?
Fotokemika's coding for papers are as follows:

PE = Resin Coated (Poly Ethylene coated paper)
K = Fiber Based (baryta coated)

The surface code appears after the paper type:

G = glossy
K = crystal (pearl)
M = matte surface.

For example, PEG would be an RC, Glossy paper, while KM would be an FB Matte paper.

What is the ISO speed of the paper, without the use of filters?
With no filter included, the Dmax is 1.90. Spectral sensitivity goes up to 570nm, with maximum sensitivity at 550nm.

VARYCON KG or PEG (FB or RC glossy):
Gradation ISO - Speed ISO - Range
no filter P 125 R 80
0 P 100 R 140
1 P 100 R 120
2 P 100 R 90
3 P 100 R 70
4 P 64 R 60
5 P 32 R 50

VARYCON KM or PEM (FB or RC matt):
Gradation ISO - Speed ISO - Range
no filter P 100 R 80
0 P 100 R 130
1 P 80 R 110
2 P 100 R 80
3 P 100 R 70
4 P 80 R 60
5 P 32 R 40

What filters should I use when printing?
Kodak or Ilford filters will work with Varycon papers. Varycon branded filters are closest to Ilford filters.

FILMS

What do the letter codes on Efke films mean?
KB means 35mm format, R means 120 roll film, and PL means sheet film (from German: planfilm).
M on sheet films means matte emulsion.
25, 50, 100, 400 of course means ISO speed of film.

What is the specific film base used on Efke films?
KB (35mm) films are on acetate, roll and sheet films are on a polyester base.

What coating technology is used?
Efke films are produced using the dipping/vertical coating method.

What grain structure is used in Efke films?
Efke films have a standard grain structure. They are not a T-grained emulsion.

Developing times in standard developers:
ISO 100 35mm, roll, or sheet film:

If exposed at film's regular speed of ISO 100, the following developing times apply:

Kodak D76/ID-11: 8 Min


If ISO 100 film is exposed at ISO 200 for increased speed and optimum differentiation of highlights, the following developing times apply:

Kodak D76/ID-11: 11-12 Min.

ISO 50 35mm, roll, or sheet film:

If exposed to films regular speed of ISO 50, the following developing times apply:

Kodak D76/ID-11: 7 Min

If ISO 50 film is exposed at ISO 100 for increased speed and optimum differentiation of highlights, the following developing times apply:

Kodak D76/ID-11: 9-10 Min.


ISO 25 35mm, roll, or sheet film:

If exposed to film's regular speed of ISO 25, the following developing times apply:

Kodak D76/ID-11: 6 Min


If ISO 25 film is exposed to ISO 50 for increased speed and optimum differentiation of highlights, the following developing times apply:
Kodak D76/ID-11: 8-9 Min.


Processing tips:
Do NOT over-expose Efke Emulsions! This film is not recommended for pull processing.

Treat the wet emulsion with extreme care. We recommend the use of hardener in the stop bath or fixer.

Never use a stop-bath with a higher concentration than 2% -- in fact, we recommend the use of plain water in place of a stop bath.