There's something to be said for working in the dark. Your sense of sight starts to diminish and your other senses take over such as touch, hearing and even smell. Most of the time you can barely see what you're doing on paper without a dim red light and even then you more often than not surprised at the final product.

Before development you can't really tell what's happening with this 'invisible ink' as you're moving it around with a paintbrush or your hands and gradually exposing section by section.
Many a time I've been disappointed and felt almost defeated at what came at the end of my somewhat blind blundering in the dark room only to leave the pictures for a week and have the colours shift into something different and change the image entirely to a far more desirable result.

Nothing is as it seems in chemography.