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សម្រស់ និង សុខុមាលភាព
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វប្បធម៌ និង ប្រវត្តិសាស្ត្រ
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ប្លង់Environment

បរិស្ថាន

215 ប្លង់មាន • 3 ប្រភេទរង

ប្លង់ (215)

Extracting Tyrian Purple from Murex Snails — The Most Precious Colour of Antiquity
Hazardous content

Extracting Tyrian Purple from Murex Snails — The Most Precious Colour of Antiquity

ដោយ CharlieDE

បុរាណ

19
0
0
0
2
0
Making Sepia Ink from Cuttlefish — The Natural Brown Ink of Mediterranean Artists

Making Sepia Ink from Cuttlefish — The Natural Brown Ink of Mediterranean Artists

ដោយ CharlieDE

ការគូរ

16
0
0
0
0
0
Tyrian Purple from Murex — The Most Precious Dye in Human History

Tyrian Purple from Murex — The Most Precious Dye in Human History

ដោយ TexFO

បុរាណ

4
0
0
0
2
0
Smelting Bog Iron in a Bloomery Furnace — From Ore to Wrought Iron
Hazardous content

Smelting Bog Iron in a Bloomery Furnace — From Ore to Wrought Iron

ដោយ ForgeNO

បុរាណ

14
0
0
0
3
0
Making Hide Glue by Boiling Rawhide Scraps — Prehistoric Collagen Adhesive

Making Hide Glue by Boiling Rawhide Scraps — Prehistoric Collagen Adhesive

ដោយ BobBE

រសាយនវិទ្យា

27
0
0
0
0
0
Boiling Water with Hot Stones in a Bark Container — Stone Boiling

Boiling Water with Hot Stones in a Bark Container — Stone Boiling

ដោយ BobBE

សង្គ្រោះបឋម

26
0
0
0
1
0
Building a Figure-4 Deadfall Trap — Stone Weight Trigger Mechanism

Building a Figure-4 Deadfall Trap — Stone Weight Trigger Mechanism

ដោយ BobBE

ពីមុនប្រវត្តិសាស្ត្រ

15
0
0
0
0
0
Setting a Simple Snare Trap on a Game Trail — Cordage Loop Hunting

Setting a Simple Snare Trap on a Game Trail — Cordage Loop Hunting

ដោយ BobBE

ពីមុនប្រវត្តិសាស្ត្រ

22
0
0
0
1
0
Drying Medicinal Herbs for Winter Storage — Preserving Nature's Pharmacy

Drying Medicinal Herbs for Winter Storage — Preserving Nature's Pharmacy

ដោយ BobBE

សង្គ្រោះបឋម

19
0
0
0
3
0
Preparing a Yarrow Wound Poultice — Prehistoric Herbal First Aid

Preparing a Yarrow Wound Poultice — Prehistoric Herbal First Aid

ដោយ BobBE

ព្រៃ

17
0
0
0
5
0
Understanding Whale Oil from Blubber Rendering — The Fuel That Lit the World Before Petroleum

Understanding Whale Oil from Blubber Rendering — The Fuel That Lit the World Before Petroleum

ដោយ BobBE

Industry 2.0 — Electricity, Steel & Oil (1870)

13
0
0
0
0
0
Extracting Omega-3 Fish Oil from Fatty Fish — The Marine Fatty Acids That Built the Brain

Extracting Omega-3 Fish Oil from Fatty Fish — The Marine Fatty Acids That Built the Brain

ដោយ BobBE

សមុទ្រ

16
0
0
0
2
0
Producing Cod Liver Oil from Atlantic Cod — Norway's Liquid Gold

Producing Cod Liver Oil from Atlantic Cod — Norway's Liquid Gold

ដោយ BobBE

ជីវវិទ្យា

21
0
0
0
2
0
Understanding Bromine from Seawater Brine — The Only Liquid Non-Metal
Hazardous content

Understanding Bromine from Seawater Brine — The Only Liquid Non-Metal

ដោយ PeterSE

តារាងខួប

19
0
0
0
0
0
Extracting Iodine from Seaweed Ash — The Violet Vapor That Prevents Goiter

Extracting Iodine from Seaweed Ash — The Violet Vapor That Prevents Goiter

ដោយ PeterSE

Industry 2.0 — Electricity, Steel & Oil (1870)

17
0
0
0
1
0
Extracting Boron Compounds from Borax — The Desert Mineral That Cleans, Fluxes, and Strengthens Glass
Hazardous content

Extracting Boron Compounds from Borax — The Desert Mineral That Cleans, Fluxes, and Strengthens Glass

ដោយ PeterSE

តារាងខួប

21
0
0
0
1
0
Recovering Magnesium Salts from Seawater — The Lightweight Metal That Burns White

Recovering Magnesium Salts from Seawater — The Lightweight Metal That Burns White

ដោយ PeterSE

តារាងខួប

40
0
0
0
0
0
Harvesting and Preparing Wild Clay from Riverbanks

Harvesting and Preparing Wild Clay from Riverbanks

ដោយ ClayDK

ដីដុសមាត់

16
0
0
0
0
0
Panning Gold from Alluvial Deposits — Gravity Separation of the Noble Metal

Panning Gold from Alluvial Deposits — Gravity Separation of the Noble Metal

ដោយ PeterSE

ការជីកយករ៉ែ

18
0
0
0
0
0
Ukuvuna Nokucubungula i-Rooibos — Izintaba zaseCederberg, eNtshona Koloni

Ukuvuna Nokucubungula i-Rooibos — Izintaba zaseCederberg, eNtshona Koloni

ដោយ SawubonaSiphoZA

កសិកម្ម

33
0
0
0
0
0