@thereisnocat Do you know the wavelength of your UV light? If your lows aren't getting dark enough in such a long time, it might indicate your UV light's wavelength isn't optimal. 365nm is supposedly best, but I found it harder to find decent options. So mine are 385nm (40W) and 395nm (200W) and the corresponding exposure times and distances are only: ~1:45min (4 inch) and ~2:40min (16-20 inch). For the latter, I initially also used a sheet of paper to diffuse the light more (for larger prints), but that extended the exposure time to ~17mins for not any noticeable difference...

(Btw. This is all for kallitype, but should equally apply for salt)

#AltProcess #Kallitype #SaltPrint #UVLight