Chapter 8: Adsorption

  The chemistry lab at school was always freezing. The air conditioner hummed a low, monotonous drone that mixed with the scratching of thirty pencils on paper.

  Yuta sat at his desk, watching a beaker of dark blue liquid. He added a spoonful of fine black powder, stirred it, and poured it through a filter paper. The liquid dripping into the flask below wasn't blue anymore. It was clear.

  "Activated carbon," Mr. Sato said, tapping the whiteboard with a marker. "Do not confuse Absorption with Adsorption. Absorption is when a fluid permeates a solid, like a sponge soaking up water. Adsorption is a surface phenomenon."

  He drew a jagged, porous rock on the board.

  "Activated carbon has a massive surface area," Sato continued. "One gram can have a surface area of over 500 square meters. It traps impurities, toxins, and colorants on its surface. It grabs them and holds them."

  Yuta didn't write down the definition. He was staring at the black powder in the beaker.

  Charcoal.

  In Elixir Online, charcoal was trash. It was the byproduct of a failed cooking attempt or the debris left in a forge. It had zero gold value. Most players walked over it without a second glance.

  "Adsorption," Yuta whispered, testing the word on his tongue.

  The bell rang.

  Connecting...

  Welcome back, Yuta.

  Riverwood was bustling. It was mid-day in the game cycle, and the square was packed with players trading loot from the morning's dungeon runs. The noise was deafening—shouts of merchants, the clatter of armor, and the roar of the forge.

  Yuta stood by the fire pit where he had cooked his venison. He checked his inventory.

  Funds: 1 Copper.

  Loot: Iron-Hoof Antlers (Rank F), Raw Venison (x1).

  He needed liquidity. He couldn't experiment with zero capital.

  He walked to the Blacksmith's workshop. The heat from the forge hit him like a physical wall. The smith, a burly NPC named Kael, was hammering a dent out of a breastplate. Sparks flew with every strike, hissing as they hit the water trough.

  Yuta waited until Kael stopped to wipe the sweat from his brow. He placed the Iron-Hoof Antlers on the anvil.

  "I have materials," Yuta said.

  Kael picked up the antlers. He didn't look at them physically; he looked at the item tag floating above them. He frowned.

  "Rank F," Kael grunted. "Low data integrity. The durability is at 15%. How did you harvest this?"

  "I don't have the Skinning skill," Yuta admitted. "And my knife is broken."

  "It shows." Kael tossed the antlers onto a pile of scrap metal in the corner. "The system penalized the drop quality because of your poor technique. I can't craft a bow with this; the code is too fractured. It's only good for grinding into bone meal."

  "How much?"

  "12 Copper. Take it or leave it."

  Yuta did the mental math. A perfect set of antlers usually sold for 20. He had lost 40% of the value because of his lack of skills and tools. It was a fair assessment of the game's strict mechanics.

  "Fine," Yuta said.

  Transaction Complete.

  Received: 12 Copper.

  He picked up his coins and walked to the Inn. The Innkeeper, a cheerful woman named Mara, was wiping down tables. The air smelled of stew and ale.

  Yuta placed the single slab of Raw Venison on the counter.

  "Fresh meat," Mara smiled, poking the steak. "A bit lean, but good for the stew pot. 4 Copper."

  Transaction Complete.

  Received: 4 Copper.

  Yuta stood outside the inn, watching the players rush by.

  Current Funds: 17 Copper.

  He was slowly climbing out of the hole. But he wasn't satisfied. 17 Copper wasn't enough to buy the sharpening stone he needed for his knife. He needed more.

  He turned back to the Blacksmith's forge. He didn't look at the weapons on the rack. He looked at the floor, beneath the massive bellows that pumped air into the fire.

  There was a mound of black dust, chunks of burnt wood, and gray ash. It was the waste product of the forge.

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  Yuta walked back to Kael.

  "Excuse me," Yuta asked.

  Kael sighed, leaning on his hammer. "Back again? I told you, 12 Copper was the final price."

  "No," Yuta pointed to the floor. "I want that."

  Kael followed his finger. He looked at the pile of soot. He looked back at Yuta. Then he laughed, a deep, belly-shaking sound that made his leather apron creak.

  "The slag? The ash? You want my garbage?"

  "Can I have it?"

  "Take it," Kael waved his hand dismissively. "You save me the trouble of sweeping it out. But don't expect a bag. You carry it yourself."

  Yuta knelt by the forge. He didn't care about the other players watching him. To them, he was a noob playing in the dirt. To him, he was mining diamonds.

  He opened his Rough Leather Pouch. He didn't have a shovel, so he used his hands. He scooped handfuls of the black, flaky charcoal and the fine gray ash into one of the empty slots.

  Item Acquired: Blacksmith’s Ash (Trash).

  Description: Burnt wood and coal residue. Dirty and useless.

  Yuta filled three slots with the "useless" dust. His hands were stained black up to the wrists. His face was smudged with soot. He looked like a chimney sweep.

  He stood up, bowed to the blacksmith, and walked away.

  He headed to the riverbank—not the place where the Goblins were, but a quieter spot upstream, near the reed beds. The water here was slow-moving and murky, filled with silt and algae.

  He took out his Chipped Mortar. He poured a handful of the coarse charcoal chunks into the bowl.

  He began to grind.

  Crunch. Crunch.

  He needed a fine powder. Surface area. He needed to break down the carbon lattice so it could trap impurities effectively. The uneven mortar made it hard, but charcoal was brittle. It crushed easily.

  After ten minutes of grinding, he had a pile of fine, jet-black dust.

  He took one of his empty vials. He walked to the river's edge and filled it halfway with the murky water.

  Item: Dirty River Water.

  Effect: High chance of "Dysentery" debuff. -5 HP.

  Then, he added a pinch of the charcoal powder to the vial. He corked it and shook it vigorously. The water turned black.

  He set the vial on a flat rock and waited.

  "Sedimentation," Yuta whispered.

  Physics took over. The heavy carbon particles began to sink. But as they sank, they dragged the dirt, the algae, and the invisible toxins down with them. The carbon atoms were bonding with the organic compounds, trapping them in their microscopic pores.

  Five minutes later.

  The layer at the bottom was a thick black sludge. But the liquid above it?

  It was clear. Crystal clear.

  Yuta carefully poured the clear liquid into his second empty vial, leaving the sludge behind.

  Item Created.

  Analyzing...

  Item: Purified Water.

  Rank: E.

  Description: Water that has been filtered of most impurities. Acts as a stable base for alchemy. Increases the success rate of brewing Rank D to Rank C potions. Essential for volatile mixtures.

  Value: Unknown.

  Yuta smiled.

  It wasn't mandatory for everything—beginners could use boiled water for simple healing salves. But for anyone trying to make something volatile, something Rank C or higher? They needed this. It reduced the explosion rate.

  He repeated the process with his second empty vial. He had enough charcoal to filter a thousand gallons. The only limit was his bottles.

  He had two vials of Purified Water. He needed to test the market.

  He walked back to the Alchemist's shop—Old Man Hobb’s Curiosities.

  Hobb was reading a thick book, his spectacles perched on the end of his nose. He looked up as the bell jingled. He saw Yuta covered in soot, holding two clear vials.

  "You look like you've been rolling in a fireplace," Hobb noted dryly.

  "I have water," Yuta said. He placed the two vials on the counter.

  Hobb frowned. "I have a tap, boy. I don't need water."

  "Look at the rank," Yuta said.

  Hobb picked up a vial. He squinted at it against the light. He swirled the liquid. There was no sediment. No cloudiness.

  "Rank E," Hobb muttered. "Purified. Did you boil this?"

  "Cold filtration," Yuta said. "Carbon adsorption."

  Hobb looked at him sharply over the rim of his glasses. "You used the ash?"

  "It works."

  Hobb set the vial down. "This is good quality. I usually import this from the City of Glass. It helps stabilize the Mana Potions I sell to the high-level guilds. Standard market price is 5 Copper."

  "I'll sell them to you for 3," Yuta said. "Wholesale."

  Hobb considered it. Buying for 3 and selling for 5 was a good margin for him.

  "Deal."

  Hobb swiped the vials. He poured the contents into a large glass jar behind the counter, then handed the empty bottles back to Yuta along with the coins.

  "I keep the water, you keep the glass," Hobb said. "I'm not buying the bottles back every time."

  Transaction Complete.

  Received: 6 Copper.

  Yuta checked his funds.

  Start: 17 Copper.

  Sale: +6 Copper.

  Total: 23 Copper.

  He had turned "Trash" into 6 Copper in twenty minutes.

  "Hobb," Yuta asked, pointing to a jar of dried green leaves on the shelf. "How much for a Healing Leaf? Just the raw herb."

  "2 Copper," Hobb said. "But don't try to make a potion in that chipped bowl I sold you. You'll waste it."

  "I'll take one."

  Yuta paid the 2 Copper.

  Transaction Complete.

  Current Funds: 21 Copper.

  He walked out of the shop. He wasn't going to make a potion yet. He needed to wash his hands first.

  He went to the village fountain. He began to scrub the soot off his hands, watching the black water swirl away into the drain. As he scrubbed, his mind began to race.

  Ash... and fat.

  "Ash is alkali," Yuta murmured, a small smile playing on his lips. "Potassium carbonate. If I mix it with water, I get lye. If I mix lye with animal fat..."

  Soap.

  As he stood there, lost in his chemical equations, a shadow fell over the fountain.

  A player walked past.

  Player: Hawkeye [Level 9]

  Class: Ranger.

  He looked like a seasoned adventurer. He wore a distinct yellow scarf wrapped around his neck that fluttered in the wind. On his back was a composite bow that glowed with a faint green enchantment, and his leather armor was studded with iron.

  He stopped for a moment, looking at Yuta.

  He saw a Level 3 player with a soot-stained face, scrubbing his hands in a public fountain, mumbling about lye and carbonate.

  The Ranger shook his head, a look of mild confusion on his face. He didn't speak. He just adjusted his yellow scarf and walked past Yuta, heading straight for Hobb’s shop.

  Yuta watched him go. Through the open door of the shop, he heard the Ranger’s voice.

  "Hobb, give me three Iron Skin Potions and a stack of Fire Bullets. I'm heading to the Wolf Caverns."

  "That will be 150 Copper," Hobb’s voice replied.

  "Keep the change."

  The Ranger walked out a moment later, his inventory stocked with store-bought power. He looked confident, ready to conquer the world with his gold and his gear.

  Yuta looked down at his own hands. They were still slightly stained with gray ash. He had 21 Copper and a head full of formulas.

  He didn't feel envious of the Ranger. He didn't feel weak.

  The Ranger was playing a game designed by developers. Yuta was playing a game defined by physics.

  "Soap," Yuta whispered again, the smile returning to his face. "Let's clean up this economy."

  He turned and headed toward the Western Woods. The deer were waiting. And this time, he had the chemistry to make every part of them count.