Under a Geoengineered Sky - Dirty Clouds

I've seen these, what I call, dirty clouds, on many occasions since spring. They float freely under the white, fluffy ones. After studying them for months I noticed that they eventually hook-up underneath, almost like graphite does.

You think it's going to rain when they build up but that doesn't happen. If anything they're perhaps used to move the ones above. I often see the combination of highly reflective clouds above the dirty clouds.

I'm wondering if they're not laden with carbon black dust.