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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