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To provide numerous choices of print contrast when using polycontrast paper such as Ilford Multigrade.

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Q: What is the purpose of polycontrast filters?
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What does a filter on a enlarger do?

If the filter is above the lens, it modifies the light reaching the negative in order to change it's color. This would be for printing color negatives, or for modifying contrast in black & white polycontrast papers. If the filter is below the lens (old, old technology) the modification is done after it leaves the lens. Those filters had to be much better optical quality so as not to degrade the image.


Why does the blood pass through the liver?

The liver filters the blood.


What is fuel filters and its type?

A fuel filter filters fuel prior to it's entry into the metering system. The type should be in your manual & is usually something like F25 (fram #25)


What are the benefits of using photo filters in digital photography?

Photo filters are used to protect the camera lens from scratches but can also cause a distortion of the image as well, causing the picture to be flawed.


How do you change the AC filters on a 2001 Honda Accord?

I just finished replacing the cabin A/C filters on my 2001 Honda Accord. The two filters are located just behind the glove compartment. The hardest part of replacing the filters is removing the glovebox. So, here is the web address I used for assistance in removing and replacing the filters on my Accord http://www.honda-acura.net/forums/archive/index.php/t-43307.html. I recommend downloading and printing all the pictures and diagrams from the links that are included on this site. The diagrams are from the Helms manual and help as a reference to avoid any snaggles. Good luck and

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What is the puropse of a cell membrane?

the purpose is that it filters what goes in and out of the cell:):)


What is waste oil and filters?

waste oil is oil that gets dumped in the ocean, its pollution whether its and accident or in purpose. Filters are special filters that the oil gos through so it can get a bit "clean."


What is the purpose of Cokin filters?

Cokin filters are used for photography and is one of the original square filters. Invented by Jean Coquin, a French photographer, he wanted everyone to have the chance to produce great creative images.


How are compressed air filters used?

Compressed air filters, which are also known as in-line filters, serve the purpose of filtering contaminants, such as dust, oil and moisture, from air after it has been compressed. They are usually used in industrial applications.


What does a filter on a enlarger do?

If the filter is above the lens, it modifies the light reaching the negative in order to change it's color. This would be for printing color negatives, or for modifying contrast in black & white polycontrast papers. If the filter is below the lens (old, old technology) the modification is done after it leaves the lens. Those filters had to be much better optical quality so as not to degrade the image.


How do air conditioning filters work?

The primary purpose of air filters is to keep the blower and evaporator coil clean. You should clean your A/C filter often to reduce unnecessary energy consumption.


What is the purpose of of DSL filters on phone jacks in your home?

they supposedly reduce/prevent interference on your telephone caused by the dsl connection


What is the purpose of having kidneys?

they clean your body, by taking out the toxins, and putting them in your urine


Are electronic air filters good to have for those with asthma?

Electronic air filters do help those with asthma. It is important to keep the plates in the device clean or it will defeat the purpose and doing what you can to remove the sources that trigger the asthma is also essential.


What are some examples of filters?

Coffee filters Air Filters in cars Water filters


What are color filters?

color filters are filters which show u a color.


What products does Wix Filters offer?

Wix Filters offers products such as Oil Filters, Air Filters, Fuel Filters and pretty much any type of filters you can think of. You can purchase products from Wix Filters from their store. There is a store locator on the official website.