Explanatory notes
… and the bonding material may be of animal, vegetable or mineral origin (e.g., dextrin, glue, tar, gum, asphalt, … that, on immersion in water or other suitable solvent, the separate layers can be readily parted and bear evidence of … also acts as waterproofing material (e.g., tarred duo‑kraft) are included in this heading, as are also paper and …