[CamDigLib]

There's plenty more about Newton's work on alchemy here: http://webapp1.dlib.indiana.edu/newton/

Hi lab notebook is also great if you're intereted in the chemistry side of things! http://cudl.lib.cam.ac.uk/view/MS-ADD-03975/1

He even includes his own ink recipe here!: http://cudl.lib.cam.ac.uk/view/MS-ADD-03975/29