Experimenting With SunPrint Solargraphs
Feel free to ride along with me for an experiment. I want to know if I can use SunPrint or a comparable product to make a day-long solargraph during the 2017 solar eclipse. I'm hoping to show a broad streak of the sun's arc get thinner through maximum eclipse, then get uniformly wider through second half of eclipse.
I don't know how much light entering the hole will cause the SunPrint paper to expose. Will the sun leave a clean streak like in solargraphs with photographic paper? Or will it blur a wide swath on photo-sensitive SunPrint paper? How sensitive to the sun is SunPrint paper? What difference does hole size make on the image when using SunPrint paper?
I set up a can akin to a solargraph but with the light sensitive SunPrint paper instead of photographic paper. One hole is the standard pinhole size, but a second hole is enlarged.
![](https://static.wixstatic.com/media/4c0e6f_6ffc855cfb5649768c7c842b360df624~mv2_d_2448_3264_s_4_2.jpg/v1/fill/w_147,h_196,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/4c0e6f_6ffc855cfb5649768c7c842b360df624~mv2_d_2448_3264_s_4_2.jpg)
After a few days, the paper yielded this image, with the smaller pinhole corresponding to the fainter sun trail below and the larger hole corresponding to the brighter sun trail above.
![SunPrint solargraph with two holes in can. Larger hole begets the brighter, upper sun arcs.](https://static.wixstatic.com/media/4c0e6f_ed556980ed954ac6879936151b7d6e63~mv2_d_3264_2448_s_4_2.jpg/v1/fill/w_147,h_110,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/4c0e6f_ed556980ed954ac6879936151b7d6e63~mv2_d_3264_2448_s_4_2.jpg)
Meanwhile, another can is mounted outside for a duration to be determined. If you've got any experience with SunPrint paper or have suggestions, feel free to contact me. Thanks.