The JSP 18K Gold Testing Acid Solution (0.5 oz) offers a professional-grade way to confirm the authenticity of 18 karat gold. Manufactured in the USA and trusted worldwide since 1980, JSP is the go-to brand for jewelers, appraisers, and collectors who demand accuracy. Each factory-sealed 0.5 oz bottle yields up to 400 tests, making it a reliable, cost-effective choice for professionals and enthusiasts alike. Compact and travel-ready, it's perfect for use in jewelry shops, pawn stores, estate sales, or home testing. How to Use: Scratch your gold item lightly on a testing stone (sold separately). Apply a single drop of JSP 18K solution to the mark. Watch for the reaction: Mark remains = at least 18K gold Mark fades = less than 18K gold Specifications: Brand: JSP Product: 18K Gold Testing Acid Solution Volume: 0.5 oz (15 mL) Yield: Up to 400 tests Application: Jewelry, coins & precious metals Packaging: Secure plastic bottle with color-coded cap ⚠️ Safety Information: For professional/adult use only. Always wear gloves and eye protection. Store in a cool, dry place away from children and pets. 📦 Sold by Duhaas Jewelry Source – Established in 1989, trusted for fine and fashion jewelry solutions.