Coffee Technology
Latest articles, industry insights and brewing guides
How to Remove Moisture When Roasting Coffee with a Hand Pan
Learn how to pre-dry green coffee beans for 10 minutes before first crack to improve evenness when hand-roasting on a mesh pan over a gas stove.
Coffee’s Three Original Species Explained
Learn the key differences between Arabica, Robusta, and Liberica — the three original coffee species — including flavor, growing regions, and caffeine content.
What Causes Coffee Astringency? The Role of Tannins
Learn how tannins in coffee cause bitterness and how grind size, brew time, and water temperature affect extraction and flavor.
What Causes Astringency in Coffee and How to Avoid It
Astringency in coffee isn't a taste but a tactile sensation caused by tannins and improper brewing. Learn how roasting and extraction affect it.
Can You Drink Water from an Espresso Machine Boiler?
Boiler water from espresso machines isn't safe to drink due to repeated heating that increases nitrate risks and may damage your health.
How to Steam Milk for Latte Art: The Essential Techniques
Learn how to steam milk properly for latte art — from temperature control to foam texture — with step-by-step guidance from a specialty coffee trainer.
What Is Latte Art and How Did It Become a Coffee Staple
Learn the origins, evolution, and techniques behind latte art, plus how to pair it with the right espresso for best results.
Why Your Espresso Tastes Bitter and How to Fix Extraction
Espresso turns bitter and dry when over-extracted. Learn the ideal 18–22% brew range and how grind, time, and dose affect flavor.
How to Make Traditional Vietnamese Drip Coffee with a Phin
Learn how to brew classic Vietnamese drip coffee using a small metal phin filter, with exact ratios, grind size, and step-by-step instructions.
The Oldest Coffee Variety: What Is Typica?
Learn which coffee variety is the oldest — the high-grown Typica — and how it shapes today’s specialty beans, including Blue Mountain and Geisha.
How Coffee Beans Grow: From Flower to Cherry
Learn how coffee cherries form, ripen, and develop the beans inside—from flowering to harvest in 6–7 months.
How to Roast Coffee at Home with a Hand Pan and Gas Stove
Learn how to roast 100g of coffee beans using just a hand pan and gas stove at home, including roast profile and flavor results.
What Makes High-Quality Robusta Coffee Worth Trying
Learn why refined Robusta beans, like India's Kappi Royale, offer bold flavors and are gaining respect in specialty coffee circles.
How to Identify and Understand Robusta Coffee Beans
Learn how to spot robusta beans, their key traits, uses, and why some high-quality versions challenge traditional coffee biases.
Arabica vs Robusta: What Really Makes Them Different
Arabica makes up 65–80% of global coffee, grown at high altitudes with complex flavors. Robusta is hardier, more bitter, and higher in caffeine.
Perfect Coffee-to-Water Ratio for Every Cup Size
Learn the ideal coffee-to-water ratio by cup, from 1 to multiple servings. Includes spoon measurements and exact gram weights for precision brewing.
How to Clean and Use a Home Coffee Machine
Learn how to properly use and clean your home coffee machine, including descaling, filter care, and safe operation steps.
How to Judge Espresso Crema Quality by Flow, Color and Taste
Learn how espresso crema indicates extraction quality—check flow time, color tone, and taste balance for the best shot.
How to Judge Green Coffee Bean Quality by Appearance
Learn to assess green coffee bean quality visually: spot size consistency, color uniformity, drying flaws, and more with this expert guide.
Do Roasting Skills or Green Bean Quality Matter More?
Green bean quality sets the upper limit of flavor potential, but skilled roasting maximizes it. Here’s how both shape your final cup.