whats this on my CLONES

can anyone tell me what is this drying on the leaves OF my clones,they are growing i just want to check so it doesnt turn out to be a problem and its too late,most of my clones have it but only the ones that i took out of the dome,never seen it before

Looks like mold. Clones are especially prone to attacks because of no/limited root development. It happens to me when I spray them down with tap water in warm temps. Usually just after I take them out from under the dome. They'll outgrow it no problem; that's not really bad either. Even if it isn't mold, they'll just need a little bit of time to adjust to the humidity, no worries.