Tag: printing

Using LC2 System to Measure UV Intensity Across a Printing Area

One of my customers wanted to know whether their UV light source was even across their printing area. This article shows you how to check this using the Light Counter LC2 UV Light Kit. Distribution of UV Light under Fluorescent Tubes Distribution of UV Light under a Osram Vitalux Bulb UV Intensity We are all…

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About the LC2 Ultraviolet Sensor

When I designed my Light Counter LC2 system, I wanted to use the best possible sensor for platinum/palladium printing. On the surface, my design requirements were straightforward: The sensor had to have peak sensitivity at about 365nmI did not want the sensor to respond to visible light nor UV-B or UV-C, so as to avoid…

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Announcing my new Light Counter LC2 System

LC2 Light Integrator LC2 UV Sensor LC2 Visible Light Sensor LC2 Temperature Sensor LC2 Power Controller LC2 Data Logger For much of the past year I have been developing a light…

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How Much Platinum Does ‘NA2’ Leave in a Palladium Print?

‘NA2’ is the shorthand name for a contrast control agent (restrainer) that’s often used with palladium prints. Its proper name is sodium hexachloroplatinate (Na2PtCl6). As you can see from its chemical formula, it contains platinum. This leads to a reasonable and fairly common question: “How much platinum does ‘NA2’ leave in a palladium print?” My…

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What’s in a Name: Platinum or Palladium Print?

There is a never-ending debate in the small world of platinum/palladium printing: what is the correct name for the prints we make? Are they platinum prints, palladium prints or platinum/palladium prints? Is there any difference? And does it really matter? Here are my thoughts on this. The process by which platinum prints are made is…

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Why Oxalic Acid Combats Black Spots

Over the last few days I’ve been reading, writing and thinking about black spots. There’s also been a big discussion about this on Facebook in the Platinum Palladium Printing group. A key question in my mind has been: “Why does adding oxalic acid to the sensitiser stop black spots from appearing?” Now I think that…

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Black Spots

Close-up of a black spot Mysterious black spots have plagued platinum printers from the early days of the medium. They tend to appear as small, dense spots surrounded by a corona or a sometimes comet-like shape. I have lost many prints to these horrible things. After reading Mike Ware’s impressive and…

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New eBook: Manufacturing Ferric Oxalate

I have just published a short ebook on manufacturing ferric oxalate for platinum/palladium printing. It’s available here: https://ianleake.com/product/manufacturing-ferric-oxalate/ Most platinum/palladium printers buy ferric oxalate from a commercial supplier. And this is exactly what I’ve done for years. This is convenient and gets you good quality material if bought from a reputable supplier. Earlier this year,…

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Workshop Report

Palladium print from a whole plate (6½”x8½”) in-camera negative. © Javier Ternero, reproduced with kind permission Palladium print from a whole plate (6½”x8½”) in-camera negative. © Javier Ternero, reproduced with kind permission I’ve just finished an enjoyable couple of days teaching Javier Ternero how to make platinum/palladium…

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