Every time new offsets appear they start out purplish and shriveled. Once they grow out a bit they turn normal color when watered regularly, but if they do not get watered for a couple weeks the offsets turn purplish again and shrivel a bit. At first I thought there was rot inside the cacti, but that was a year ago and they have been growing vigorously since then.
I have never seen this before, the two of these I have are very fast growing cacti that produce large amounts of offsets.
Any ideas on the genus/species would be helpful.
Thanks
![Image](http://www.cactiguide.com/forum/userpix/2556_IMG_0566_1.jpg)