clones yellowing from middle out?

so i took about 24 clippings from from my plants that are about to be taken out of veg. There are 2 blueberry, 2 ww-max, 2 aurora indica, and 2 orange bud. they are in 20 oz. solo cups with smaller opaque solo cups covering the tops. i spray them twice a day with a very mild bloom soloution. they are in soil/perlite/vermiculite, 50/25/25. for the most part they seem good to me...no drooping or wilting really. they area week old. this psat day i have noticed them yellowing from the middle out? not sure what that means at all, more nutes spraid on them? that just diverting energy toward root development? dieing?

any suggestions would be much appreciated. this is my first time cloning so i am not sure what to expect at all

I had the same problem and I stopped foilar feeding and added once every other water a mild nute for your NPK values. I use liquid karma or super thrive and fox farm Big bloom. Also the superthrive can help with any yellowing or shock etc.

Sorry I am not a scietist I can just share my experiences,

so how ofter did you water? were you stillmisting the inside of the cups?

I've made quite a few clones and they seem to start to yellow (some almost go paper white) at the top when they begin growing roots. You can tell roots are starting to grow because the clone is much 'firmer' in the medium when you pick it up. When they grow roots and start to pick up nutrients they soon 'green up' and start growing