In regards to your question about the antiverse seal it is intentionally black and white for a reason, you see its related to the lore of the antiverse in regards to the light of creation. In various metaphysical schools of thought and even in Kabbalahistic lore, it is understood that the light of creation also known as Ain Soph, is an extension of source. Another way to think about this is how the extension of the limitless light that emits from source appears as the ocean of eternity (river of light and sound) in the formative plane.
This is depicted utilizing the colour white, due to the distillation of this creative light into the lower planes that takes on manifestation of form, energy, consciousness, etc. The light reaches a point of separation once it enters into the realms of causality where duality is established. Thus we have the spectrum of light. In alchemical and sorcerous works we know that there is an inherent connexion between all things for example.
The difference between Mars, Dragons Blood and the colour red, they seem like separate things however they resonate with the side of the light spectrum that is red. By incorporating that colour into the antiverse seal you are limiting it to that one isolated spectrum. The white colour therefore in the seal represents the forces of creation, whereas the black represents non-existence/acausality/the antiverse so i would not recommend it.