cyanotype new kit formulary

hi. i'm experimenting with cyanotype for the first time, the new formulary kit by dr. ware. how can i tell if i have over or under exposure after the rince?
what is the difference in aesthetic between over and underexposure after the process is complete? :confused: are there any significant changes in the chemical to let you know when the print is ready to be rinsed? any ideas would be greatly appreciated.