Oh, you're right--if that is how it works, balance should cause it to be green. [ADDITIVE PRIMARY COLORS.]

Perhaps we should conduct a survey to find that answer. Having people with light gems recharge the master stone might indeed help. Though I also wonder if perhaps it would deplete the magic in our fragments...

[She's thinking out loud with that. So far they have very little information, apart from Don't Cross The Streams. And given how that went, she wants to consider other deleterious possibilities.]