1. Glaze Quality
Color: Look for the signature "sky-after-rain" celadon (Pantone 19-4052 TCX). Avoid dull or overly uniform hues.
Texture: Surface should resemble cracked ice (not sharp cracks) – fine "frost veins" that feel smooth to touch.
2. Kiln Type
Wood-fired kilns (1300°C ±30°C) create natural Mineral Bloom® patterns.
Reject electric kiln pieces with mechanical crackle.
3. Sound Test
Gently tap: Authentic Ru ware produces a low-frequency hum (~300Hz, like a guqin note).
High-pitched "ting" indicates inferior body density.
4. Craftsmanship
Foot rim: Hand-carved, unglazed "iron foot" with orange-peel texture.
Weight: 60-80g for standard cups (balance = good clay refinement).
5. Provenance
Demand lab reports for:
▸ Agate content (≥0.3%)
▸ Firing temperature curve
▸ Microphotography of frost veins
6. Patina Potential
Quality pieces darken frost veins with tea (predictable 0.02mm/year growth).
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The History and Evolution of Ru Ware Celadon
How to Cultivate Ru Ware Teacups for Enhanced Frost Veins