<story><title>Platinum Photography</title><url>https://whyisthisinteresting.substack.com/p/the-platinum-photography-edition</url></story><parent_chain><item><author>balou23</author><text>I did not really understand this point.&lt;p&gt;&amp;gt;The first reason is linked to one of the drawbacks of platinum photography. Although the resulting images are far superior, platinum does not react as quickly to light as silver. This means that you can only make an image using the contact printing technique&lt;p&gt;Wouldn&amp;#x27;t that just mean you have to wait longer?</text></item><item><author>vGPU</author><text>&amp;gt;You can’t take a small negative and project it onto the paper, as you do with an enlarger for silver gelatin prints.&lt;p&gt;Pretty much sums up the point. Using 8x10 or whatever size negatives when  film rolls were coming about is a non-starter for the general public.&lt;p&gt;The cost seems very high as the other commenter has mentioned also. From a quick search purchasing a kit will give you a printing cost of ~$15&amp;#x2F;photo. This immediately relegates it to the realm of hobbyists with money. Canvas prints of that size may be a bit cheaper for someone seeking something that’s a bit more special than a regular photo.</text></item></parent_chain><comment><author>seszett</author><text>&amp;gt; Wouldn&amp;#x27;t that just mean you have to wait longer?&lt;p&gt;You would have to wait &lt;i&gt;much&lt;/i&gt; longer with a standard enlarger, probably several &lt;i&gt;days&lt;/i&gt; and that&amp;#x27;s without taking into account reciprocity failure. In practice, it just wouldn&amp;#x27;t work.&lt;p&gt;I haven&amp;#x27;t tried platinotype myself since platinium and paladium are so expensive, but I do print a lot of cyanotype which has a similarly low sensitivity and I built a UV enlarger for that, which works quite well with exposure times on the order of a few minutes for enlarging 35mm onto A5 paper.&lt;p&gt;It requires a 40W 365nm UV LED source though, cooling for the negative in order not to burn it, and a few other tricks to get it to work well.</text></comment>
<story><title>Platinum Photography</title><url>https://whyisthisinteresting.substack.com/p/the-platinum-photography-edition</url></story><parent_chain><item><author>balou23</author><text>I did not really understand this point.&lt;p&gt;&amp;gt;The first reason is linked to one of the drawbacks of platinum photography. Although the resulting images are far superior, platinum does not react as quickly to light as silver. This means that you can only make an image using the contact printing technique&lt;p&gt;Wouldn&amp;#x27;t that just mean you have to wait longer?</text></item><item><author>vGPU</author><text>&amp;gt;You can’t take a small negative and project it onto the paper, as you do with an enlarger for silver gelatin prints.&lt;p&gt;Pretty much sums up the point. Using 8x10 or whatever size negatives when  film rolls were coming about is a non-starter for the general public.&lt;p&gt;The cost seems very high as the other commenter has mentioned also. From a quick search purchasing a kit will give you a printing cost of ~$15&amp;#x2F;photo. This immediately relegates it to the realm of hobbyists with money. Canvas prints of that size may be a bit cheaper for someone seeking something that’s a bit more special than a regular photo.</text></item></parent_chain><comment><author>dietrichepp</author><text>&amp;gt; Wouldn&amp;#x27;t that just mean you have to wait longer?&lt;p&gt;In theory, yes. The actual values may help. I’ve heard exposure times cited around eight minutes. That’s for contact printing using the sun as a source. I don’t know off-hand how much light an enlarger will deposit on paper, but it is a few orders of magnitude less than the sun. For the sake of estimating, let’s say 3 orders of magnitude.&lt;p&gt;This gives an exposure time of 5 days. Note that you’d want to make a test strip or two—someone who knows what they’re doing might want two test strips to dial in the exposure settings, at which point it takes you 15 days to make the first print (but then only 5 days for each additional print from the same negative).</text></comment>