Ohhh...sorry, so you have tried CS. I only used 30ppm for external, and I see result in 3days. I gave only 10ppm orally to a stray recently for loss of appetite and within less than 4days, he back eating normally. This particular kitty is hard to trap, so we had to give something fast and early 1st. The last time my friend tried daily for almost 2wks to trap him, in the end, mission still failed, but at that time, we didn't know about this colloidal silver thing.
Lime sulphur is effective for ringworm, but wow! pray everything work out well and kitty won't start licking before you rinse thoroughly.