Hi Gary,
Sorry for the issue.
We also hope to have such a color change of desiccant. However, it does not have.
The color change of desiccant in our condition is not obvious, the human eye can not see the difference.
So the only way to solve this problem is to repair it. We will rebake the whole camera, seal it, and check the air tightness. Most fo time, it will works.
So please contact our support: support(at)zwoptical.com, send him an image with the problem.
Thanks
Chad