Blood Magick?

Actually Brann, I've heard it's considered an insult by some rune workers, as feminine blood is dead, not living and does not require any sort of sacrifice on the person's part. It's considered more or less smearing bodily waste product on them, which is considered an insult to the runes themselves as some treat them as living entities. Those who treat them as entities feel it necessary to make a proper sacrifice to them, or to make a sacrifice as it happens, either by pricking themselves or by accidental small injury.

In my own experience, I've never used feminine blood on my runes. I've used it for other, fertility based non-Kemetic things, but never on my runes. For me, it would be the same as smearing that blood on any of the Kemetic deity representations I have. However my experiences have shaped me. :)

Interesting, Sataset. The information I had was what I had gleaned from
research. I am not a woman, obviously, and did not know it might be an
insult. Thank you for this insight :)

Does anyone know what gives blood its properties?

Yes, science describes this quite clearly in the lovely revolving double helix diagram. Blood is literally you. From your blood scientist could clone you. Doesn't that say enough? Did you know that Japanese scientists cloned a mouse from a single drop of blood! How powerful is that?!