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In the second episode of the anime, Senku Ishigame said the Calcium Carbonate
they were gathering had four applications. Fertilizer for growing crops, raw
material for building houses and soap.

What's the fourth application of Calcium Carbonate according to Senku
ishigame?


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2019-07-19T13:45:27.603
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2019-08-13T17:47:53.770
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question
dr.stone
What's the fourth application of Calcium Carbonate according to Senku ishigame?


From what the first three stated and from a little research, I think it may be
the combination of the three which is HUMAN CIVILIZATION. Because, from what i
have read in on [this page](https://www.ima-na.org/page/what_is_calcium_carb)
and from analysis, it is a very essential compound for the start of a human
civilization.

And according to that link, “chalk” is composed of calcium carbonate and used
in writing 10,000 years ago. Well, writing IS a form of communication and thus
increases the chances of survival and thus “realize it is major spoilers” and
thus, evolution of stone age to modern age. That is what i had in mind.


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2019-08-13T08:38:26.183
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2019-08-13T17:47:53.770
2019-08-13T17:47:53.770
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answer


The fourth application of Calcium Carbonate is explained later in the
manga/anime and it's a bit of a spoiler. But it's used in :

> The making of Gunpowder. It's explained in Chapter 7 The gunpowder adventure
> and the third episode of the anime Weapon of science.


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2019-08-13T09:10:08.730
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