Gold Test Needles-Set Of Four-10K-14K-18K & .999 Silver

Gold test needles are an essential tool for jewelers performing acid-based metal testing. This set of four needles covers three gold karats — 10K, 14K, and 18K — plus .999 fine silver, giving you a reliable reference for the most commonly tested metal finenesses.

To use, select the appropriate karat needle and rub or scratch it against a test stone. Make a corresponding scratch or rubbing with the item being tested alongside the needle mark. Apply a drop of testing acid across both marks and observe the reactions. If the item reacts identically to the needle mark, the karat or fineness may be the same. If the item dissolves faster than the needle mark, the gold content may be lower; if it dissolves slower, the gold content may be higher. For silver testing, a dedicated silver test acid is required.

Please note: acid-based metal testing is subjective and requires careful observation and practice to master consistently.

Features

• Set of four test needles for comparative acid testing
• Covers three gold karat standards: 10K, 14K, and 18K
• Includes one .999 fine silver needle for silver testing
• Used alongside a test stone and testing acid to compare metal reactions
• Enables visual comparison of acid dissolution rates to estimate karat or fineness
• Silver needle requires a separate silver test acid for accurate results

Specifications

Notes

• Acid-based metal testing is entirely subjective, and results should be interpreted with care.
• Mastery of this testing method requires practice and careful observation.
• A test stone and appropriate testing acids are required and are not included.
• Silver testing requires a dedicated silver test acid.
• This product is subject to California Proposition 65 warnings for Lead and Phthalates.