Help! I recently moved my 30+ year old cactus outdoors for the summer season. It had been inside all winter with very limited light. I moved it outdoors (high temps 85 F Low Temps 45 F) into the sunlight for about 4-5 hours of the day. I accidently gave it a little too much water about a month ago and havent watered it since. Since then it has slowly turned purple and now more black from the bottom up. The new growths from last year are shrivled discolored. Is this cactus dying due to being overwatered once? Is this a bad sunburn? What can I do to save this cactus (Repot in dry soil)? Does a black cactus mean it is dead or will it turn green again? It does not seem to be really soft and mushy. I have posted a few pictures of the cactus along with a couple smaller ones that were treated the same and are doing well. What kind of cactus is this? Thanks.
