After a bit more research it seems like the cream or white color in several lubes is due to the inclusion of zinc oxide, an anti-wear ingredient. I'm less enthusiastic about that since it probably leaves some residue that could accumulate. May not be the best thing to have in the wicks. I bet it also contributes to the slightly gritty feeling which you've noticed. I'm more curious about Novalube now (re: post #15).