That's 788°F. You sure about that? And yes, the original paper cited uses the same value.
ETA on further review, it does seem to be in the correct range for baking bread in this manner.
"The parameters on which the trials were based were drawn from the results of a long-standing experimental activity previously conducted13,14. Solid doughs made from stone-ground organic flour mixed with other ingredients were baked in replicas of HTs. These were placed in dome-shaped ovens, similar to those found in the settlements where these types of vessels were discovered, at an initial temperature of 420 °C for about two hours. In the former case, the resulting products resembled large bread loaves, while in the latter case, the presence of lipid ingredients made the products softer and more flavorsome, akin to a sort of ‘focaccia’ type bread (Fig. 3a) (SI Appendix, Fig. S1)."
It doesn’t necessarily prove that they did.
Although the article presents pretty convincing evidence that they did. (Ceramic formation on the clay trays that matches the temperature and composition of focaccia residue).
So unless they are just making up data for their paper (which is something that definitely happens), it sounds legit to me.
>"These investigations suggested that large loaves made with water and flour might have been baked on these trays, placed in domed ovens for about two hours at an initial temperature of 420°C."
That's why they are using words like "suggested" and "might". When dealing with ancient civilization often all we have leftover are tools that survived. It's not like we have cookbooks from that era. So all we have is guessing what they might have done, based on attempting to solve the same problem with the same tools.
If you see tiny “shrimp eyes” in your water, he wrote, the water is roughly 155°F. If you see “crab eyes”—a slightly bigger bubble—then you’re reaching 175°F. Larger “fish eyes”: 185°F. String of pearls: 195°F to 205°F. And finally, when your hot water has reached a rolling boil, or a “raging torrent,” you know that your water is 212°F."
And we're talking about a six pound loaf apparently which is just massive. I'm a pretty experienced bread baker, have done it professionally albeit briefly. My baker's intuition is that this would work.