I didn't want to highjack DMForcier's thread so am starting a new one. Some of this was posted in an earlier thread, but I've finished the test now so will post the relevant parts here.

I had a bunch of Charleston Hot peppers (C. annum) that I picked at the end of the season. I picked all the ripe ones and made them into sauce but of the remaining unripe pods, any that showed the slightest color change from yellow to orange went into a closed paper bag with a Gala apple. I didn't take a pic of them in the bag on day one, but here's the plant the same day I picked them, October 8. Note that not all of these peppers were put into the bag -- the green ones were thrown out and only the yellow ones that had at least some hint of orange went into the bag (most only had a trace of orange color):

Here they were on October 13, 5 days in the bag:

And here they are today, October 15, after 7 days in the bag:

The colour change was phenomenal in the first 5 days, but didn't change further by day 7 and in fact one pepper was going bad, so today I shut the experiment down, halved the peppers, seeded them, and froze them.

I should point out that while I put an apple in the bag, I am not claiming the apple actually caused the color change as I did not do a control of peppers just sitting on a counter. Apart from the one that started going bad, the peppers were in good shape after 7 days, so maybe the moisture from the apple in the closed bag helped keep the peppers firm, whether they ethylene did anything or not.

After 5 days the peppers had colored nicely, although they never did gain the deep red color of the ones that ripened directly on the plant. The went to a bright red, with some hints of orange remaining.

Now for the all important taste test. When I ate the peppers straight off the plant, they tasted much like a red bell pepper, but much sweeter. And with heat of course. When I tasted the peppers after ripening 7 days in a bag, they had none of that magic sweetness, in fact, they are bordering on slightly bitter. So I got a nice color, but the taste was a fail.

These will be used to heat up sauces that I flavour with other ingredients, or just to heat up dishes by adding a half or several to the cooking pot.