Let us consider a human civilization on the level of Plato's Ancient Greece or quite close. They have metal tools and weapons, horse and bull powered chariots, ships with sails and paddles, democratic societies, and philosophers start to use Scientific method in understanding reality. Probably they are little more advanced. Btw, Ancient Greece is little more advanced than we usually think:
- they build Antikythera mechanism to track celestial bodies for navigation:
- they build first steam machine, like the one build by Hero_of_Alexandria
- they also have some contradictory theories of electricity (ancient Greece philosopher Thales studied static electricity)
And, one day they found a mysterious micro-organism, called Godly Yeast. If you put spores of this micro-organism into bath with water, food waste, and animal bones and stones rich in alkaline-earth metals (Ca, and so on), in few hours they will dissolve bones and produce some sort of plastic material. This material is like soft clay in first few hours on air. You can form it as you like. Than it is dried and is strong as soft wood - you can easily carve it with metal or bronze knife. On the next day it is as hard as steel. And it has density similar to bones. When water is dried, the Godly Yeast produce spores, that can be gathered and used once more.
In real live corals can produce quite strong material, but this Godly Yeast is much more effective.
So, with very little effort you can build solid tools and machinery details with durability and quality of, for example, 19th century industrial developed country like Great Britain. And, building them is really cheap - usually bones of domestic animals are thrown away, and there is a lot of stones rich in Ca on ground surface.
If you add rusty metal into this bath with bones and Godly Yeast, it will produce conductive material.
Also Godly Yeast can be used in fuel cells to produce electricity.
So, the question is:
What society level will be after 100 years of Godly yeast usage, 200 years, 300 years, 400 years?
Can they pass industrialization age? They can produce tools and details required without heavy machinery and hard labour, so there is more spare time for everybody, and he/she can spend it for education.
PS: consider this civilization is situated on remote islands (say, Atlantis) - there is some trade with other world, but military invasion is really hard to perform, and all this civilization neighbours are on neolithic society levels with low population. The remote islands surface is similar to the Greece. There is few major cities. The number of inhabitants is like in Ancient Greece.
PPS: civilization neighbours are much less advanced, because they have survived famine from few natural disasters, which greatly reduced population, and so, the society level. And they do not pose any thread to civilization which uses Godly Yeast.
UPD: Godly Yeast is considered to be the Gift of Gods - it's origin is mysterious (probably it is bio-engineered organism from wrecked spaceship of highly advanced civilization), but it do not prevent this civilization to widely use it.