The pictures didn't post in the right order. The healthy ones are mixed in with the bad ones, but I think most of you will be able to tell which are the bad ones I'm talking about

I'm thinking two things. Too much sun too fast, which I did to my arborescens, or some poured something on it, like bleach.

Your plant looks like a Ballyi to me. I only have one Ballyi, which is a hybrid, and another NOID that was labeled as a Lavranos 1970 -- so, it's a Ballyi-TYPE. Hence, my Ballyi experience is limited. But -- I am wondering if your plant is getting too much fertilizer. Right now, all my Sans are planted in a mix that is 1/3 sifted C/S soil, 1/3 sifted and washed pumice, and 1/3 sifted chicken grit. They are in "bright light" most of the day, but not much direct sun (although, they LIKE direct sun). I water with plain water, no fertilizer except maybe 3 or 4 times a year. For me, the only succulents I fertilize all the time are the ones in total gritty mix. If a plant has soil, even just one-third of the mix, it gets less frequent fertilizing.

Regarding the two plants that have yellowing (at least it looks like yellow on my computer) -- is it yellow and soft, or yellow and hard? If it's soft, I might remove that plant and either toss or nurse back to health separately. Yellow and hard -- I might be brave and see what transpires.

I would watch that fertilizer. I seldom use any. I believe your plants got bleached by the sun. Happened to one of my Fernwoods.

I think everyone is right. One night my roommate turned on the a/c. The plant was on the floor under it, and the air was facing up, but being so close to a source of cold air didn't help it. Also, I frequently bring this plant to the roof for morning sunlight. One day I forgot it, and it took full Sun all day. The heavy fertilizing also contributed to the damage.

The good news is that the two healthy ones in that pot are still healthy. I'm going to throw out the two that were damaged, and will try to find replacements. I want that pot full. It's a setback, but I definitely learned, and I'm not depressed over it. I'm determined to make a success of it.

Thanks to everyone who chimed in and gave me advice. I truly appreciate it.

By the way, the ones that had turned white became totally transparent, soft to the touch, and were weepy. Have been too busy working several jobs, but will tend to it tomorrow. The damaged ones are going in the garbage

You should cut off what good leaves that are left and root them in that pot. Save yourself some money!

It's definitely sun burn which can take several days before it shows up after it's been exposed to too much sun. I've had burn show up on certain plants up to 5 days later. That day in the full sun was all it needed to get burnt too.

the sun it gets on your fire escape is probably way more than it needs. Taking it up to the roof is probably benefiting you more than the plant.

Vitorama: I would, but Sans are so slow to grow. It would be years before those plants grew.

Ryan: I'll keep them on my fire escape. It survived all winter with very little sunlight, and I had to mess it up with too much sun

Hi Manuel,

Sorry to hear abt this. Perhaps cut off the damaged leaf & treat the cut w/ dry cinnamon to help contain the damage?

Nice Ballys, handsome.