1(ish) hour update time: while it's hard to see by my phone, 1 and 3 are clearly fading. 2,4 and 5 all have faint discolouration at the top. 6 seems to be going strong. I should credit
@bowringgroup, who did this first, and better, with glassware:
pubs.rsc.org/en/content/arti…