"You can find many videos demonstrating this hack. It absolutely works in some situations. Spices tend to get clumpy when they've been exposed to moisture, either because the lid was left off or you just have a lot of humidity in your home. The essential spices in your pantry like garlic powder are especially notorious for this. Rubbing the jars together creates friction that is amplified by those little bumps."
"It's not just spice jars that have these bumps on the bottom. It's any glass jar or bottle made in the modern world, even your salt shaker. These bumps are called stippling or knurling, and they're part of the manufacturing process. That texture allows the still-hot glass bottles to move more quickly down the conveyor belt without sticking during manufacturing. Knurls also reduce tensile stress on the glass. In other words, those bumps help prevent the glass from breaking. They're not about spice flow."
Many spices clump when exposed to moisture or humidity, causing slow or clogged pouring. Rubbing the bases of two jars together can help because the textured bumps amplify friction, vibrate the glass, and mechanically shake spices loose. The bumps on the bottoms of jars and bottles are called stippling or knurling and are created during manufacturing to help hot glass move on conveyor belts, prevent sticking, and reduce tensile stress to avoid breakage. Those bumps are not designed specifically to improve spice flow, but the rubbing trick can be a useful, situational kitchen hack.
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