A Book of Shadows/Grimoire should always be blessed and consecrated as a magickal tool.
It should have a spell cast over it to keep others prying eyes out of it.
Wiccan Wonderings: What is a Book of Shadows? Also known as a Grimoire, this is a handy reference item. A Witch’s guide and magickal diary, a Book of Shadows is what Witches use to record their observations and experiences. It includes everything from successful spellcraft formulas to the proper preparation of potions and timing for talismans. The Book of Shadows is akin to a bible for the Witch, who will turn to it again and again for insights, ideas, and tried-and-true recipes.
Singer, Marian; MacGregor, Trish (2004-08-06). The Only Wiccan Spell Book You’ll Ever Need: For Love, Happiness, and Prosperity (p. 26). F+W Media, Inc.. Kindle Edition.
A Book of Shadows (sometimes called a BOS) or Grimoire is your personal book and first magickal tool. It should contain all the rituals and spells you do. It can also contain information on herbs, essential oils, Gods, and Goddesses. Corresponding colors, days of the week, Moon phases, etc for the best outcome of a spell. In mine I also jot a note or two on how the spell worked. If not so well then I try to think of why it didn’t and make a note of that also. Basically your Book of Shadows or Grimoire is your Witches journal or diary so you can put anything in it pertaining to The Craft that you want to.
A Book of Shadows doesn’t have to be fancy like the one pictured. It can be as simple as a spiral notebook. I suggest using a three-ring binder that you can decorate yourself so you can add page to it easily; as your knowledge in The Craft grows so will your Book of Shadows. The color of the binder itself is a personal choice. My profile picture is a Celtic Pentagram that I colored in myself and it adorns my Book of Shadows which has grown into a medium size three-ring binder. I will be getting a larger one when I find the right size and color I want.
No one else should ever pick up and/or go through your Book of Shadows because it should only contain your energy. After all you wouldn’t just let anyone read a regular diary or journal…right?