From time to time I develop some filmstrips with C41-chemicals. The data-sheet gives already some valid combinations of time/temperature, but it was lacking the one for 30°C.
I put the filmstrips for 8 min into the tank with the old Tetenal-kit. But what about the Digibase one? Linear interpolation would be not sufficient.
So lets take the sampling-points from the datasheet and do some cubic fitting (polynomial degree one less than the amount of samples).
And now what? Compute it myself? Hell no 😉
Et voila (thank Stephen Wolfram).
By the way: 7 min 30 s would be the correct time!