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Electron Microscopy Sciences

Technical Data Sheets

EMS Kodak D-19® Replacement

EMS Catalog #74200

Summary

This is a published formula originally designed for use with x-ray materials and is now recognized as an excellent developer for aero films and plates when high contrast is desired. EMS Kodak D-19® Replacement is a high contrast developer used primarily for scientific applications with spectroscopic films ands plates, high resolution plates and films such as Tech pan and high speed infrared.

EMS Kodak D-19® Replacement provides higher than normal contrast and speed, higher than average graininess, high capacity, clean working and fast acting.

Chemical Safety

All chemicals are dangerous and must be treated with respect. Please read the warning label on each package.

Metol

Some individuals become sensitized (develop allergic symptoms ro rashes) when using methol. If this should occur, discontinue use AND consult a physician.

Hydroquinone

Is considered by the EPA to be hazardous and a skin sensitizer.

The user assumes all risks upon accepting these chemicals.

Mixing the Working Solution

You will need a one-liter plastic storage container and a larger glass or plastic mixing container.

Chemicals Liter Gallon
Distilled Water (48°C/125°F) 500 ml 2500 ml
Metol 2 grams 8 grams
Sodium Sulfite 90 grams 360 grams
Hydroquinone 8 grams 32 grams
Sodium Carbonate (Monohydrate) 52.5 grams 210 grams
Potassium Bromide 5 grams 20 grams
Cold Water to Make 1 liter 4000 ml

Dissolve all chemicals in the order given. Place the warm water in the mixing container and add a pinch of the sodium sulfite. (A small amount of the sodium sulfite inhibits the initial oxidation of the metol. If more is added at this point, the metol will not dissolve.) Add the metol and stir the solution to dissolve the solid. It is important that all of the metol is dissolved before the remaining sulfite is added. Add the sodium sulfite and stir to dissolve the solid. Add the rest of the chemicals in order, stirring to dissolve each one before adding the next chemical. Finally, add the cold water to bring the total volume up to 1000 ml or 4000 ml, depending on the kit you have. Stir the solution thoroughly.

Metol and Hydroquinone, in these proportions, produce very high contrast.

Using the Developer

This developer is recommended for use at temperatures from 65°F (18°C) to 70°F (21°C). Best results will be obtained within this range; however, acceptable results will be obtained at somewhat higher and lower temperatures.

These are the recommended starting times based on undiluted developer. Determine the correct time and temperature using test strips.

  • 60°F for 12 minutes.
  • 65°F for 10 minutes.
  • 68°F for 9 minutes.
  • 70°F for 8½ minutes.
  • 75°F for 7 minutes.

Stop, fix and wash in the usual manner.

Online Ordering

EMS Kodak D-19® Replacement is available online from the EMS Catalog. For ordering or product information, click here.