Kind of looks like old leaves at the end of their life. How long has the plant been growing? Maybe a bit dry and underfed, but mostly just played out.

If you want to try again, do you have Trader Joe's where you are? Their orchids are super and not expensive. The only catch is that most of the time they are planted in spaghnum moss, which is a tricky growing medium. Too wet. Check to be sure the orchid has viable roots (you can lift it out of it's ornamental pot and easily see the roots through the clear plastic) The orchids at least are in pots with slits already, though they are temporary (inserted in other more stable pots. Also some roots above the "soil" line are good, as they are usually in great shape. What you do, is get one you like (phalaenopsis is a really good choice as they are pretty tough), and be prepared with a pot slightly bigger than the one they sell the plant in and medium orchid bark. do not hesitate to repot it immediately. Like the moment you get home. You can cut the plastic pot off with scissors, two cuts opposing each other. Make a nice BIG mess carefully extracting the spaghnum, starting in the middle where the roots are likely dead. Be careful of the roots, only removing the rotten ones. If it smells bad, be sure to dust with Rootone, otherwise not really necessary, though I usually do it. Hold the plant suspended over the new pot in the right position with one hand, and gradually pour in the bark with your other. Give the pot a shake or knock periodically to get the bark to settle amongst the roots. Water once in your kitchen sink, set it in a tray or on a plate in moderate light, then don't water for a couple weeks. meanwhile, it shouldn't even blink unless something was wrong with it to start. My feeling, and others might disagree, is that it is more risky to leave the plant in the soggy spaghnum than to repot immediately. As for your one that is dying, you can see water in the bottom of the pot, so for some reason it didn't really drain. Orchids REALLY need good drainage. Good luck next time around! Janine

possibly powdery mildew. Where are they growing? Greenhouse? Outdoors? Indoors. Please post picture of entire plant and surroundings

I have same problem, and water with rain water. I was able to save enough that it lasted whole winter - have few gallons left. Hope that's all it is. Using well draining mix should help some.