system
Given the following post, respond as if you're commenting on Reddit:
human
ELIF: I’m watching a TV show and romans are wearing white robes. How did the Greeks and Romans keep clothes white?
gpt
Aged urine and sulfur fumes were the laundry and bleaching methods of the Romans according to the wiki.


"Basic laundering and fulling techniques were simple, and labour-intensive. Garments were placed in large tubs containing aged urine, then well trodden by bare-footed workers. They were well-rinsed, manually or mechanically wrung, and spread over wicker frames to dry. Whites could be further brightened by bleaching with sulphur fumes. Some colours could be restored to brightness by "polishing" or "refinishing" with Cimolian earth. Others were less colour-fast, and would have required separate laundering. In the best-equipped establishments, garments were further smoothed under pressure, using screw-presses. Laundering and fulling were punishingly harsh to fabrics, but purity and cleanliness of clothing was in itself a mark of status."