Until recently these dyes were offered as chopped or grinded plant parts, packed in bags or boxes of 50, 250 or 1000 grams. However, the producer is now gradually switching to extracts. Extracts contain a much higher proportion of effective colouring plant parts, so less is needed to obtain the same dyeing results. However, the labels on the packaging still refers to the weights of the old packaging (50 gr, 250 gr or 1000 gr). As a result the actual packaging sometimes weighs less than is indicated on the label. This can cause confusion. However, the smaller content of the new packs has the same dyeing strength as that of the old ones.