Gold Test Needles-Set Of Five-8K-10K-12K-14K & 18K

Gold test needles are an essential tool for jewelers and precious metal buyers who need to verify the karat purity of gold items using acid testing. This set includes five needles spanning the most commonly encountered gold karats — 8K, 10K, 12K, 14K, and 18K — giving you a comprehensive reference range for comparative acid testing.

To use, select the appropriate karat needle and rub or scratch it against a test stone. Make a second mark on the stone with the item being tested, placing both marks side by side. Apply a drop of testing acid across both marks and observe how each reacts. If the item being tested reacts identically to the test needle mark, the karat of the two pieces may be the same. If the item dissolves more quickly than the test needle mark, the gold content may be lower than the selected needle's karat. If the item dissolves more slowly, the gold content may be higher. Please note that acid testing of this type is entirely subjective and requires careful observation and practice to master.

Features

• Set of five gold test needles covering 8K, 10K, 12K, 14K, and 18K
• Used for comparative acid testing on a test stone
• Allows side-by-side comparison of acid reactions between known and unknown gold items
• Spans a wide karat range to support identification across common gold purities
• A practical reference tool for jewelers, appraisers, and precious metal buyers

Specifications

What's Included

• 8K gold test needle
• 10K gold test needle
• 12K gold test needle
• 14K gold test needle
• 18K gold test needle

Notes

Acid testing with test needles is a subjective method, and results depend on careful observation and practiced technique. Testing acid and test stone are not included and must be obtained separately. This product contains lead and/or phthalates — see California Proposition 65 for details.