– Appearance: tube, straight, horizontal heads, no cracking, no broken. Accepted curvature: diameter ≤ 3.5mm.
– Color Natural color (green, purple, black, white and yellow)
– Smell & Taste: Characteristic taste. No strange smell.
– Using time: 30 – 60 minutes in 5-30oC water. Recommended: restricting to use in hot water from 500C up.