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So, after much discussion, I thought it was time to actually test my working hypothesis. Now, in fairness, some inks seem to disintegrate even when they are kept in dark boxes, and this little test did not account for those inks. Many FPNers insist that ink bottles be kept in the boxes and away from light. I've argued that ink should be kept away from direct light, but indirect light was not harmful. Most FPNers state that ink will break down when exposed to heat. My experience was somewhat different, I had ink in a caboose without air conditioning or heat for more than a decade and didn't find any problems. So, here was the test, I took several liquid ink samples, I put them in my office window for more than 7 months (March-October) in the direct sun during the Las Vegas summer. The hottest day on record was this summer at a whopping 117. I chose some inks known to be fade resistant and others known to be faders. In prior tests, I found that inks that were diluted or washed were prone to fading or fading faster, so I also included some diluted inks. I also used plastic and glass containers. What this experiment will NOT reveal is the effect of cold on ink. As you may know, in the three decades that I've had ink in the caboose or the months these inks have been in my window, we have had no snow in my area of town. (Other parts of town had a few inches a few years ago.)