color question

[ae6black]

I just cooked Chicken and rice in a Lodge DO. Something puzzles me. I've seen this before. When the meal sits in the closed pot after cooking, it has a tendency to turn dark grey. This is a definite color change. When the meal was done and I removed the coals, the color was normal. However, since I was taking this to a group gathering I left it in the closed pot to stay warm for about 45 minutes. When uncovered, Everything, particularly on the top had turned dark grey. Any ideas what's going on?

 

[Squigie]

Was it lined with aluminum foil?

 

[ae6black]

no

 

[KCStudly]

Was there any acid in the recipe, tomato, wine, vinegar, citrus? Acid can react with the CI and turn things gray.