Ruri finds sea glass on the beach and runs into her classmate Shoko, who has a secret passion for minerals.
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1. Daddy, Daddy!
2. Look what I got.
3. This one's smooth and slippery.
4. And this one's sparkly!
5. Wow, you found all that yourself?
6. My, my. Look at all those rocks.
7. You like rocks huh, Shoko?
8. Yeah, I love them!
9. Look!
10. All these rocks are different colors.
11. This one has stripes.
12. And this one's round.
13. We can find a ton here.
14. Wanna look for them with me?
15. They're just rocks.
16. This is no fun.
17. You're weird, Shoko-chan.
18. Okay, everyone.
19. Recess is over.
20. Come back inside.
21. Okay!
22. Sensei!
23. Look, I found a rock.
24. A really pretty one.
25. Wow, you're right. That's very pretty.
26. Now, let's put it down
and join the rest of the class.
27. Huh?
28. Wait! Sensei.
29. Sensei!
30. You're sad that the others didn't understand?
31. Mommy, is it weird to like rocks?
32. Of course not. Don't worry, sweetheart.
33. Just be yourself.
34. Really?
35. Yes, really.
36. That reminds me.
37. I got some delicious castella cake.
38. Want some?
39. Yeah...
40. Great. Then you go wash up.
41. Okay!
42. That happened at preschool?
43. So she's still into rocks, I see.
44. Even more than ever.
45. She wants to be a rock professor someday.
46. Really? That much?
47. Daddy!
48. But I wouldn't want rocks to be her career.
49. She'd be better off keeping it as a hobby.
50. I think so, too. Besides,
I'm worried it won't pay well.
51. You're right.
52. What if she worked with
flowers or sweets, instead?
53. Research Notes
54. Shoko, you up?
55. Breakfast's ready!
56. Okay, I'm coming.
57. How's school been going?
58. Seaside Recycling Studio
59. Seaside Recycling Studio
60. It's exams week.
61. You seem a bit down.
62. Really? I'm fine.
63. Today's the last day of exams, right?
64. Maybe you should go out
with friends after school.
65. It's okay. I have stuff to do.
66. I'm off.
67. Kiryu Higashi High School
68. Finals Exam
1. World History A
2. Information Studies
3. Homeroom
69. Finally! We're done!
70. Ready, Ruri?
71. Let's head to the beach!
72. Hey!
73. Quit dragging your feet.
74. I'm so exhausted.
75. It's the beach!
76. Man, this is the life.
77. Told ya it'd be fun.
78. Sure, but it's a bit far to come after school.
79. Who cares? We're done with exams!
80. Ugh. Don't remind me about that!
81. You guys, come over here!
82. Yeah, wait up!
83. What's this?
84. It's so blue and pretty.
85. Hey guys! Take a look... at...
86. Maybe it's agate.
87. Or what's it called without bands?
Chalcedony?
88. I'll ask Nagi-san when I get home.
89. Tanigawa-san?
90. Oh. Hey, Seto-san!
91. Short time no see.
92. What's up? Wanna swim with us?
93. No thanks.
94. Um, what's that you're holding?
95. Oh, this?
96. I just found it! Cool, huh?
97. It's a blue gem. Could be worth something!
98. It's glass.
99. Huh?
100. It's a glass fragment from a bottle
or something, not a gem.
101. B-But there're minerals like agate
that you can find on the beach.
102. Genuine blue agate isn't transparent like that.
103. That's glass waste, no doubt about it.
104. It's virtually worthless.
105. Trust me, I've searched
this beach up and down.
106. Searched...?
107. What's up? Was that Seto just now?
108. Nagi-san!
109. I found this at the beach.
110. Could it be anything other than glass?
111. That's an odd question.
112. Looks like sea glass.
113. Is that a gem?
114. Nope, it's glass.
115. Sea Glass
116. Glass fragments that become rounded
117. from being tumbled by the waves.
118. Many develop a frosted surface.
119. Ugh, that was misleading!
120. It's a fragment of man-made glass, for sure.
121. Maybe from a bottle or something.
122. So there's zero chance it's something else?
123. Why? Does it have to be?
124. It doesn't have to be, but...
125. So that's why.
126. A girl from class told you
the same thing, huh?
127. She told me it was worthless garbage.
128. I guess she looks for stuff along that beach.
129. You mean she collects minerals, too?
130. Hey, if you ask me, that isn't just glass.
131. Really?
132. So it's something else?
133. U-Um, well it's definitely glass, but...
134. Ahem.
135. My point is that it's not worthless.
136. Huh?
137. Okay, you two.
138. Got your gear?
139. All right, let's go!
140. It's cool to have Imari-san
taking the lead for a change.
141. Yeah, let's see what she has in store.
142. Sea glass has its own origins, just like rocks.
143. We'll look for that first.
144. Like a source site?
Glass waste has deposits?
145. Mmhm!
146. Garbage dumps!
147. Hold up! We're dumpster diving?
148. Yup.
149. J-Just to check if I'm following...
150. We're not rummaging through
stuff like that, are we?
151. What the—Seto-san?
152. Wait, I never meant you're garbage!
153. Is that the classmate she was talking about?
154. I promise! It's a misunderstanding!
155. Sure looks like it.
156. Hi, is it Seto-san?
157. Do you know where we could find
a lot of trash around here?
158. You're looking for trash?
159. A rice bowl fragment.
160. This looks like a good spot.
161. What are those people doing?
162. It does?
163. Looking for sea glass.
164. Yeah! We might find you-know-what!
165. I don't get it. All that work for some trash?
166. Nice. What's you-know-what?
167. O-Oh yeah!
168. I never knew you collected minerals.
169. I do, too—
170. Found one!
171. Just as I thought.
172. Yeah, that's a nice find.
173. I wonder what she found.
174. Imari-san, whatcha find?
175. H-Hey, wait up.
176. Whoa, so cute!
177. Such a pretty blue bottle!
178. This is the same color as the rock I found.
179. Aww man, turns out it was glass.
180. Is that trash from around here?
181. I've never seen a bottle like it in stores.
182. Well, that's no surprise.
183. Judging from its form and imperfections,
it's probably close to 100 years old.
184. Stoppered Bottle
185. Asymmetrical Body
186. Air Bubbles
187. 100 years old?
188. Why would something like that be here?
189. It's all based on how people
used to process waste in the past.
190. In the old days, it was common
for people to process their own trash.
191. Non-combustible
waste was buried
in a hole
192. Over time, the glass waste
drifted into the ocean,
193. broke down, and eventually
washed up on the beach.
194. Drifts back to shore
195. So when there's a lot of glass or
ceramic pieces like you can find here,
196. that usually indicates there's
an old garbage site nearby.
197. That means there's a better chance
of finding old bottles intact.
198. This one looks more recent. Or is it old?
199. There's no processing
at the base, so it's pretty old.
200. You can tell by the bottle's base?
201. It's called knurling.
202. Knurling
A process that prevents
scratches on the bottle's base
and protects soft glass
during manufacturing.
203. Bottles made after the 1960s usually have
204. small ridges at the base
from the knurling process.
205. This one must be from
before the mid-Showa era.
206. The glass waste here must all be pretty old.
207. That's way before I was even born.
208. So it wasn't just any glass piece.
209. You think so?
Maybe if it was in its original form.
210. Still feels like ordinary glass to me.
211. It may seem normal to
find glass along the beach.
212. But just think of just how
uncommon it'd be anywhere else.
213. Glass
214. Water
215. Eyedrops
216. Cosmetics
217. Etc.
218. Glass is a useful material,
219. but ever since plastic came along,
it's been used less and less.
220. Plastic
221. Water
222. Eyedrops
223. Cosmetics
224. Etc.
225. Cheap
226. Lightweight
227. Durable
228. Safe
229. On top of that, people aren't meant
to process their own garbage like they used to.
230. "Capital Beautification as an Olympic Sport"
231. A major turning point marked by the
modernization of waste management services and a shift in public awareness about garbage.
232. Start of the widespread use
of hygienic plastic buckets
233. They may just be glass pieces along the beach.
234. But in a way, these are remnants of the past.
235. And they'll eventually break down
until we can hardly see them.
236. When you put it that way,
they start to feel finite.
237. Not that it's great, since they're
still waste at the end of the day.
238. But all things considered,
they're historical artifacts.
239. One day, we won't be able to
find glass on the beach.
240. It might be worth keeping one piece...
241. Isn't it pretty?
242. Yeah, I guess.
243. Nagi's Respite
244. Glass products come in a wide range of colors, like blue, green, and purple. These colors aren't achieved simply by adding paint to clear glass. Instead, they're the result of carefully controlled chemical reactions, developed through trial and error over time.
For example, blue glass is made with cobalt oxide, green with chromium oxide, and purple with manganese oxide. Amber glass, commonly seen in beer bottles, is produced by reacting iron oxide with sulfur and carbon.
Historically in Japan, opal glass was made by mixing in bone ash,
obtained by burning animal bones. While bone ash is still used today,
other materials like fluorite and quartz may also be added to achieve a similar milky white color, which, incidentally, has strong light-blocking properties.
Similarly, amber glass effectively blocks light, particularly shortwave
ultraviolet radiation. In contrast, blue glass offers little to no UV protection, showing how glass can have different characteristics depending on its color.
If you look around, you'll notice glass comes in many
different colors, often chosen for more than just their appearance.
245. Nagi's Respite
246. How pretty
247. What is it?
248. I found one!
249. Another pretty shade of blue.
250. And here's a medicine bottle.
251. Hey, isn't it weird
how most of these are blue?
252. Or should I say greenish blue?
253. I wonder why.
254. Maybe it was popular.
255. Like Ramune soda bottles.
Those are the same color.
256. Imari-san!
257. Why's there so many blue bottles?
258. You got this one?
259. Mhmm.
260. It could either be to cut costs or
261. because of supply shortages,
depending on the time.
262. Ordinary glass can have
a greenish blue tinge.
263. Glass is normally blue?
264. Yup. Material for glass
turns this color if not—
265. How? Glass is typically made from silica.
266. Silica is a colorless, sand-like mineral.
267. It should stay colorless
when made into glass.
268. At the very least,
it shouldn't turn blue on its own.
269. Is that wrong?
270. I mean, that's what the book said...
271. Seto-san, I can tell you've been studying.
272. Silica
273. Weathered quartz broken down
into sand-like particles
274. Weathering
275. You're right, silica is
a raw material for glass.
276. But like any other sand found in nature,
277. we can't forget the presence of impurities.
278. The most common impurity
in silica is iron oxide.
279. Ferrous Oxide
280. A type of pottery
called celadon gets
its blue-green color
from ferrous oxide
281. This is what gives glass
a greenish-blue tint.
282. To make it fully colorless, you need
to add ingredients that counteract it.
283. For example, the addition
of selenium can counteract
the blue from iron oxide
284. But that's difficult to fully achieve.
285. Even the clear glass we see today often has
a faint green-blue tinge along its edges.
286. Did that make sense, Seto-san?
287. Yes, that makes a lot of sense.
288. Nice, another cool bottle!
289. Aw darn it, it's cracked.
290. Wow, I've never seen this before.
291. It's a bottle for Konpeito sugar candy.
292. You can tell? What about this?
293. Imari-san sure is having fun today.
294. Hey, who are those people anyway?
295. Oh right!
296. The one who looks more
dependable is Nagi Arato.
297. And the other person is Yoko Imari.
298. Isn't Imari-san the one
who looks more dependable?
299. Tanigawa-san, I wasn't
asking about their names.
300. Whoa! This is cool looking!
301. Wh-What is that?
302. Senpai! We talked about this—
303. Hey, Imari-san! Imari-san!
304. Go on, they want your help again.
305. Coming! What happened this time?
306. Look! It's a rainbow-colored bottle.
307. It's silvered glass!
308. Silver? Even though it's rainbow-colored?
309. That's its name, but this isn't actual silver.
310. Is this due to impurities, too?
311. Nope, the iridescence is
from changes to the glass itself.
312. This type of silvering occurs
when glass weathers underwater.
313. Take for example, when sodium
gradually leaches out of soda glass.
314. The affected surface changes and
forms a thin film of different material.
315. Sodium-depleted glass (thin film)
316. Glass
317. When white light hits the film,
some of the light reflects off the surface,
318. Glass
319. while others pass through
and reflect underneath,
320. making only certain colors visible.
321. The color depends on the film's thickness.
322. Thin film
323. Glass
324. Red
325. Green
326. Blue
327. Even in the same bottle, the film's thickness can vary,
328. which is how it gets its rainbow-like appearance.
329. Structural Color
330. This phenomenon of light waves and color
is called structural color.
331. Soap Bubble
332. Jewel Beetle
333. Pearl
334. Morpho Butterfly
335. So if you keep glass underwater,
it'll eventually look like this?
336. I should try that sometime!
337. This phenomenon doesn't happen overnight.
338. I bet that bottle is decades old.
339. Oh yeah, duh.
340. Man-made glass and weathering
from Mother Nature...
341. Combine both and you get this silvered glass.
342. Makes glass feel special all the more.
343. Since that's all settled...
344. I wouldn't mind finding one myself.
345. Can you tell us where you found it?
346. Right over here!
347. Let's all look together!
348. Phew, we found so many.
349. Ready to head home?
350. Hang on one minute.
351. Seto-san! Thanks for sticking around today.
352. I had fun looking for glass together!
353. N-No problem. Thanks...
354. We should do it again!
355. Collect minerals, I mean!
356. Sure.
357. Seto-san.
358. Here, this should keep it from breaking.
359. Thank you.
360. I really learned a lot today.
361. U-Um, are you from a glass studio?
362. Huh?
363. Oh! Not at all.
364. I'm just a student.
365. I study mineralogy in college.
366. Really? In college?
367. You study mineralogy in college?
368. Imari-san, ready to head out?
369. Well, I hope to see you around.
370. Wait!
371. What is it?
372. U-Um... Well...
373. I-I've always liked minerals.
374. But not many people understand, so...
375. I take it seriously, really.
376. I read a lot of books.
377. And I have my own rocks.
378. They're just from around my
neighborhood, but I collect them.
379. I...
380. I... I want...
381. I want to be a mineralogy researcher one day!
382. Is it... difficult to... become one?
383. I think it's a lot of fun!
384. It's not all easy, of course.
385. But you don't need to worry about that right now.
386. If you have something you want to be,
387. and you're able to choose that path,
388. I say go for it.
389. You'll find your people along the way.
390. I'm rooting for you. Good luck.
391. Thank you.
392. Oh boy, that was a lot coming from a student.
393. I'm a bit embarrassed.
394. M-Me, too! I mean...
395. I've never told anyone about this before.
396. So I feel... embarrassed, too...
397. Shoko Seto.
398. "Shoko" as in the kanji for glass.
399. No wonder. A researcher in the making, huh?
400. It's great that you made a new friend
with the same hobby.
401. I dunno about that.
402. We're in the same class, but
we haven't really talked much.
403. So what? You have plenty of time
to become friends.
404. You think we can?
405. Sure, you can.
406. Ruri, have you ever heard of what blue glass
used to be called in Japanese?