Also, PLA really doesn't get along well with the caustic and wet environment of the concrete which makes me kinda worried for the structural integrity of the center hub. Might have to switch to something like PETG for that if it turns out to be a problem.
Might also make sense to use PETG for the mold to make it reusable.

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Kinda wobbly though…

looks like something got under the center hub while casting, causing it to turn out at a slight angle. Looks like I need to fixture it better for the next attempt

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I feel like everyone is missing the most important part in this very serious debate about AI sentience! Meow.

After a bit of a hiatus (which was really just me getting really distracted by photo chemistry) I'm working on my record lathe again. Took some time yesterday to cast the concrete platter which now gives me some time where I can just do nothing while it cures over the next few days and still feel productive.

Got myself some Erythrosine dye for dye sensitization experiments and ended up making a *very* pink fountain pen ink. I love it!

I've been playing around with trying to make panchromatic/orthochromatic cyanotypes by using a dye sensitization process similar to what's used in silver halide emulsions after finding a reference to adding fluorescein to the sensitizer. No luck so far though…

All of these tests were exposed inside the rainbow cardboard box and they all only responded to the blue light. At least I've got a pretty good impression of the spectral sensitivity of the sensitizer now, so that's nice I guess.

Since my fluorescein hasn't arrived yet I've been using erythrosine which is also used in normal film. It's really hard to find any kind of information on the specifics though.

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Totally forgot to post this. Latest successes of taking in camera cyanotypes. Ammonium ferrioxalate in an agar binder on a 4x5" glass plate, "developed" with potassium ferricyanide. Exposure took a whole day but hey, it looks pretty nice!

Today's exposure with ferric citrate sensitizer. Not as much detail in the shadows, but still a pretty nice look. Might have also just been a little more cloudy today.

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Took another photo using my cyanotype glass negative process! Iron Oxalate sensitizer on an agar coated glass plate. One day exposure.

you may not like it, but this is what peak optical performance looks like

Shot of my living room window taken using my home made cyanotype camera. 4x5" glass negative. Exposure time was around 8 hours.

And this concludes today's episode of Kris' weird shit

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