ofwoodandbone:

In most witch tales involving the Devil, there includes a very specific detail about signing a book. 
The witches would sign the Devil’s Black Book in blood. It marked the beginning of their life as a witch. 
The term ‘black book’ also pops up in much other folklore on witches. It is their book of magic, usually gifted to them by the Devil. It held not only all of the infernal knowledge imparted to them, but some of their magic as well. 
If this sounds familiar, it’s because it is. Most magical circles call these grimoires, or Book of Shadows for Wiccans. 
The signing of the Black Book was thought to be one of the first steps in the witch’s journey. Makes sense. Their first step was to sign their personal book of magic. It signifies not only a new beginning, but a dedication to their craft. Signing something in blood is not something to be done lightly. 
Every time I begin a new grimoire, I sign it in red ink. Yes, you can use red ink to substitute blood in magic. Many witches make their own inks with red ochre. 
It will empower your book and bind you to it. It will be yours. 
It will be your very own Black Book.