Mostly packed in steel drums, wooden casks or barrels with inner paper bags. Liable to leakage from the containers. Some dye stuffs deteriorate if in contact with air.
Dyestuffs fall into many different chemical classifications, but they can be split primarily into products soluble, and insoluble in water. In the case of soluble dyestuffs, any wetting may cause an actual loss of dyestuff by leaching the material out of the package. The remaining color may or may not have undergone some chemical deterioration with a permanent loss in value, or it may merely have changed physically and may be capable of reconstitution by drying and grinding, with comparatively small loss in value. Dry pigments, if allowed to become damp or wet may suffer much greater loss in value than dyestuffs; they would certainly require to be retreated by a manufacturer.
Neither insoluble dyestuffs nor pigments in the form of aqueous pastes should be allowed to dry out, even partially, and if for any reason drying has taken place they require retreatment by a manufacturer, and there may be considerable loss. If the pastes are allowed to become frozen, retreatment may again be necessary and, once again, the loss may be considerable, although in both cases it is sometimes possible to recover the greater part of the value of the material at the expense of retreatment costs and some physical loss.
Contamination of any sort may result in loss in value and will probably necessitate retreatment.
Certain dyestuffs and pigments decompose when heated. In general no adverse effect is likely below 120/140 degrees F. A number of products melt under the influence of heat, with or without decomposition; if there is no decomposition the material can probably be retreated, e.g. by grinding by the manufacturer without serious loss. If even partial decomposition has taken place, the products may be a total loss. See also IMDG Code & US CFR.
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