Moersch Photochemie Cyanotype Kit

Moersch Photochemie Cyanotype Kit
Brand: Moersch Photochemie
Product Code: MCK
Availability: In Stock
Price: €49.79
inc. vat @ 23%
   - OR -   

This kit contains 100ml of Sensitiser, 250ml of Nitric Acid, 100ml Hydrogen Peroxide and one Syringe. The sensitiser is Mike Ware's new formula which we find to be superior to the traditional cyanotype.

While the traditional Cyanotype process is relatively easy to do and non-toxic, the new process by Mike Ware offers many advantages such as:

·         Exposure times are much faster.

·         Papers absorb the sensitizer better, resulting in less chance of stickiness on the surface which can damage your negative.

·         Very little of the Prussian blue image is lost in the wet processing.

·         The chemicals have a superior shelf life.

·         It uses a pure iron salt which is more consistent.

·         No need to wait until print is dry to judge final image.

 

The Negative

A negative the same size as your desired final image is required. This can be done in the Darkroom by enlarging smaller negatives to sheets of Lith film or by inkjet printing a scanned negative or digital file onto digital film.

 

Applying the Sensitizer

In subdued lighting or under red light, apply the sensitizer by brush (natural hair is best) in both top to bottom and side to side directions to ensure even coating. Use the enclosed syringe to apply the sensitizer. Other ways of applying the sensitizer are with coating rods, foam brush, jay cloths or synthetic cotton wood. We find the foam brush easy to use with little or no streaking.

Allow the paper to dry in a dark room. The colour of the sensitizer should remain yellow or yellow-green but if it has turned blue, then this is an indication of an un-suitable paper as the highlights have become chemically fogged.

 

Exposure to UV light

When dry, lie your negative on the paper and place a sheet of glass (with polished edges for safety) over the negative to keep it pressed flat against the paper. Expose under UV light (outdoors or with a bank of UV lights). Exposure times are much shorter than with traditional Cyanotypes – 1 minute in bright sun or 4 minutes under artificial UV light are good starting points.

 

Processing the print

Use lab grade gloves for all the following steps.

 

Development

Traditionally the print is developed in gentle running water (or several changes of static water) face down until the yellow colour from the sensitizer has been fully removed from the highlights. This usually takes about 20 minutes. You will notice a lot of blue coloured water washing out of the print and the image will reduce in intensity. However, a stronger image can be obtained by first processing the print in a dilute mix of Nitric acid (bottle labelled Salpetersaure – mix it 1:19) for 30 seconds, followed by the 20 minutes in plain water described above. The acid bath will accumulate Prussian blue which will eventually stain the paper, so it should be replaced after a number of prints. A general guideline is to mix a fresh 1 litre acid bath for each five to ten 8x10 prints.

 

Contrast Control

By varying the strength of the Nitric acid at the above development stage, contrast can be adjusted. This may be more convenient than having to make a new negative.

 

Optional Stage

The print will intensify as it dries so the final image cannot be judged until fully dry. In order to “preview” the finished dried image, place the developed print in a tray of Hydrogen Peroxide (bottle labelled Wasserstoffperoxid – mix it 1:100 by gently adding the acid to water, not the other way) for roughly 30 seconds. The treatment intensifies the image and provides a preview of how it will look when dried. This means there is no need to wait for prints to be fully washed and dried before deciding if additional prints need to be made with adjustments to your exposure or developmet.

 

Final Wash

Wash to print in gentle running water for at least 20 minutes. Check for a total removal of the yellow stain of sensitizer from the unexposed areas of the print. If the stain is still noticeable, continue washing.

 

Drying

Hang your prints to dry in a dust free environment.

 

Safety Precautions

While the newer Cyanotype chemicals are more toxic than the traditional, there is little need to worry if you take the necessary precautions as you should with any chemical. Always wear gloves when mixing the chemicals and when processing prints. Lock all chemicals away safely when not in use.

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