2026-03-25
25| Grade Indicators of Dried Porphyra Yezoensis (Nori) | ||||||
| Grade | Color | Luster | Taste & Texture | Appearance | Weight Group | |
| Grade | Mark | (g/100 sheets) | ||||
| Special | Special | Dark blackish brown | Extremely bright | Fresh, extremely aromatic, tender, soft, slightly sweet, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, holes, edge shrinkage, stiff spots, dead spots, chrysanthemum spots, green algae, diatoms. | 280～310 |
| Grade | 311～330 | |||||
| First | First | Dark blackish brown, slightly reddish brown, slightly bluish brown. Color is slightly lighter than Special grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, holes, edge shrinkage, stiff spots, dead spots, chrysanthemum spots, etc.; green algae and diatom spots are allowed in less than 5% of the sheets, with an area not exceeding 3mm×3mm and a quantity of 1-3. | 280～310 |
| Grade | 311～330 | |||||
| First | FirstS | Dark blackish brown, slightly reddish brown, slightly bluish brown. The color is slightly lighter than Special Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, holes, stiff spots, dead spots, chrysanthemum spots; but shrinkage-like stiff edges no larger than 10mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Shrinkage | ||||||
| First | FirstO | Dark blackish brown, slightly reddish brown, slightly bluish brown. The color is slightly lighter than Special Grade. | Bright | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, edge shrinkage, stiff spots, dead spots, chrysanthemum spots; but 1-3 holes with a diameter of no more than 2mm are allowed on the sheets. | 280～310 | |
| Grade | Fresh, aromatic, tender, no off-flavor. | 311～330 | ||||
| Hole | ||||||
| First | FirstT | Dark blackish brown, slightly reddish brown, slightly bluish brown. The color is slightly lighter than Special Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, holes, edge shrinkage, stiff spots, chrysanthemum spots; but 4-6 green algae spots with an area of no more than 3mm×3mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Green Algae | ||||||
| First | FirstG | Dark blackish brown, slightly reddish brown, slightly bluish brown. The color is slightly lighter than Special Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no damage, cracks, holes, edge shrinkage, stiff spots, chrysanthemum spots; but 4-6 diatom spots with an area of no more than 3mm×3mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Diatom | ||||||
| Grade | Color | Luster | Taste & Texture | Appearance | Weight Group | |
| Grade | Mark | (g/100 sheets) | ||||
| Second | Second | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but cracks with a length of no more than 5mm are allowed on less than 5% of the sheets; 4-5 green algae and diatom spots with an area of no more than 5mm×5mm are allowed. | 280～310 |
| Grade | 311～330 | |||||
| Second | SecondS | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but shrinkage-like stiff edges no larger than 15mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Shrinkage | ||||||
| Second | SecondO | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but up to 4 holes with a diameter of no more than 3mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Hole | ||||||
| Second | SecondT | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but 7-10 green algae spots with an area of no more than 8mm×8mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Green Algae | ||||||
| Second | SecondG | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but 7-10 diatom spots with an area of no more than 8mm×8mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Diatom | ||||||
| Second | SecondD | Dark brown, bluish brown. The color is slightly lighter than First Grade. | Relatively Bright | Fresh, aromatic, tender, no off-flavor. | Sheets are flat, uniform in thickness, with neat edges; no chrysanthemum spots, stiff spots; but a small amount of dead spots are allowed, with an area ratio of no more than 5%. | 280～310 |
| Grade | 311～330 | |||||
| Dead | ||||||
| Spot | ||||||
| Third | Third | Light dark brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. 6-7 green algae, diatom and dead spots with an area of no more than 5mm×5mm are allowed on less than 10% of the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Third | ThirdS | Light dark brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. Shrinkage-like stiff edges no larger than 20mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Shrinkage | ||||||
| Grade | Color | Luster | Taste & Texture | Appearance | Weight Group | |
| Grade | Mark | (g/100 sheets) | ||||
| Third | ThirdO | Light brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. But up to 4 holes with a diameter of no more than 3mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Hole | ||||||
| Third | ThirdT | Light brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. But 10-12 green algae spots with an area of no more than 8mm×8mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Green Algae | ||||||
| Third | ThirdG | Light brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. But 10-12 diatom spots with an area of no more than 8mm×8mm are allowed on the sheets. | 280～310 |
| Grade | 311～330 | |||||
| Diatom | ||||||
| Third | ThirdD | Light brown, slightly yellowish | Relatively Bright | Fresh, aromatic, slightly tougher than Second Grade, no off-flavor. | Sheets are relatively flat, relatively uniform in thickness, no chrysanthemum spots. But dead spots are allowed, with an area ratio of no more than 10%. | 280～310 |
| Grade | 311～330 | |||||
| Dead | ||||||
| Spot | ||||||
| Fourth | Fourth | Light black, relatively yellow | Slightly Dull | Slightly tougher than Third Grade, no off-flavor. | Sheets are relatively flat, with obvious wrinkles, dead spots, chrysanthemum spots, holes; green algae mixed in no more than 20%, which can meet the use requirements of low-end roasted dishes. | 280～310 |
| Grade | 311～330 | |||||
| Fifth | Fifth | Relatively yellow, yellow | Dull | Slightly tougher than Fourth Grade, no off-flavor. | Sheets are uneven, with severe wrinkles, edge shrinkage, damage, dead spots, chrysanthemum spots, holes; green algae and diatoms mixed in more than 20%. | 280-330 |
| Grade | ||||||
