Rather than respond to everyone in turn, I will just respond to myself.
A ritual would make it easy to find true love.
Ok people - think outside the box. What if a ritual were used to make an enchanted pair of glasses that can find true love?
Rituals are not just used for a thaumatergical effect - they're also used to make enchanted items.
As for feeling true love or whatnot, the symbolism necessary should be sufficient.
And why does the blood have to be liquid?
Liquid blood uses its potency for SPELLCASTING. We've never seen a weaponized WC catch. I don't see how it would matter if the catch (which is symbolic) is in liquid form or powder.
Additionally, if you're a purist, you could just put a little bit of thinner in the "true love blood", put it in the head of a hollow point, and seal it with wax.
This isn't chemistry - it's magic.
Yup - like I said.
I think some folks make it more difficult than it has to be.
WCVs burn if they com in contact with their catch, and feel uncomfortable around it. The obvious conclusion is that it should not be that hard to weaponize their catch.
Hell, if you were to cut up a well used Obama campaign poster (that was used almost as an idol of hope), put the small pieces in the heads of bullets and blast a Malvora, it should work as a catch.