Thats very interesting and some thing we have never encountered before.
Please do the following
1) That sample please send it to us (use the contact button on the left or the email address "michael at mayhems do co dot uk" I will cover the costs for P&P. We will need your paypal details so we can cover the costs involved. Please include this info in the email, what Sort of lighting you are using, what type of tubing you are using, A photo of the effected bottles, your receipt from were you bought it.
2) We will send you out some PH strips for free to check the PH of your Liquid once you have contacted us. Please report back what the PH level of your Liquid is in you water cooling loop. The glass was it rinsed with tap water or DI water. Chlorine & fluoride in tap water can upset the balance of the PH and all so effect dyes.
3) We will replace your liquids (we will cover all costs involved)
4) Be assured we will sort this problem out, how ever it may take a little time.
Please do this asap
Thank you.
Mick