Support me on Patreon: In this video I evaluate three easy-to-obtain sources for low-concentration Hydrofluoric Acid (HF) and use them to etch Silicon Dioxide layers. I also go over the dangers of Hydrofluoric Acid and the differences between it and other acids, such as Sulfuric Acid. DISCLAIMER: The videos on this channel feature materials, equipment, and activities that may be hazardous. By choosing to replicate or participate in any demonstrated activities, you acknowledge and assume all associated risks. You the viewer are responsible for your own safety. ProjectsInFlight and its creators are not liable for any resulting harm or damages. Affiliate Links to Chemicals & Tools (I earn small commissions on these links): Calgonate: Butyl Gloves: Eyewash: Face Shield: Chemical Goggles: Apron: Respirator Mask: Acid Vapor Respirator Cartridge: Whink Rust Remover: Armour Etch: Porcelain Etch: Scribe Tool: Silicon Wafer (P-type): Silicon Wafer (N-type): Links to Sources: SDS Pages: 2% HF SDS: 10% HF SDS: 50% HF SDS: Sulferic Acid SDS: Whink Rust Remover SDS: Porcelain Etch SDS: Armour Etch SDS: Other Info: SDS Toxicity Categories: Vapor Pressure: %20Acid/articles/ Toxicity: Toxicity: #:~:text=Exposure%20to%20concentrations%20%3E50%25%20HF,to%208%20hours%20following%20exposure. Toxicity: Dermal: Chemical Compatibility: Chemical Compatibility: Toxicity: #:~:text=Possessing%20high%20corrosive%20potential%2C%20HF,high%20toxic%20potential%20is%20expressed. Toxicity: Accident List: