Wow! This is a great example, I think, of why this sub-forum is appropriate. The chemicals involved here (sulfur, hydrogen and oxygen) are the same involved in producing acid rain, the balanced formula for which is: 2SO2 + O2 + 2H2O => 2H2SO4. Given that acid rain is an unfortunate fact of our times, one might expect its affects on woolens to be similar to those encountered by our regimental ancestors? If the black powder of yore was a problem, then perhaps we should stay out the rain too (if another reason was even needed)!