How to use a refractometer for beginners / quick Gemology tutorial
1:50
YouTubewhat the gem
How to use a refractometer for beginners / quick Gemology tutorial
This is a refractometer, one of the key tools in gemology. It uses light, a polarising filter, and a tiny drop of refractive liquid to measure how light bends inside a gem. I’m testing an aquamarine here. You’ll see how the shadow line moves as the filter rotates, showing the high and low refractive indices. Their difference is the ...
6.1K views10 months ago
How to Use a Refractometer
（全）剑桥英语语法在用 初级 Essential Grammar in Use 4th
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（全）剑桥英语语法在用 初级 Essential Grammar in Use 4th
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Choosing the right lube matters more than most people realize. Just because something feels slippery doesn’t mean it’s safe. Skip the shampoo, conditioner, lotion, baby oil, Vaseline, and cooking oils. They can irritate sensitive tissue, increase the risk of infection, or damage condoms. Water-based lube is a solid choice, but you’ll likely need to reapply. Silicone-based lube lasts much longer and is my go-to for anal sex. Just don’t use it with silicone toys. Your lube should make sex better,
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Choosing the right lube matters more than most people realize. Just because something feels slippery doesn’t mean it’s safe. Skip the shampoo, conditioner, lotion, baby oil, Vaseline, and cooking oils. They can irritate sensitive tissue, increase the risk of infection, or damage condoms. Water-based lube is a solid choice, but you’ll likely need to reapply. Silicone-based lube lasts much longer and is my go-to for anal sex. Just don’t use it with silicone toys. Your lube should make sex better,
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