I have the Bjelkhagen book and have tried to obtain some of the dyes with a lot of frustration. I have seen Bjelkhagen's work with super resolution printed holographs. They are amazing. Images that can be printed in a book, but 3D, high color saturation , resolution and contrast. Dare I use the word 'magical'?
I would recommend this book to anyone interested in holography. Dye sensitization is only one early chapter.