Abstract: Magnetic iron oxide pigments useful in magnetic signal recordings having a dependence of coercivity on temperature in the temperature range of from 76K to 298K of less than 0.13 kA/mK and having a coercivity on powder compressed to 0.9 g/cm.sup.3 of greater than 51 kA/m are prepared by coating a magnetic iron oxide core material having the composition FeO.sub.x where x is a number from 1.33 to 1.5 in a first step with a compound containing divalent and trivalent iron having a ratio of Fe(III): Fe(II) from 0.01 to less than 2, and then in a second step coating the pre-coated core with a second coating of a cobalt compound.

Abstract: Reactive dyestuffs of the formula ##STR1## wherein R, D, R.sub.1, R.sub.2 and n have the meaning indicated in the description,and their use for dyeing textile materials containing hydroxyl groups and textile materials containing nitrogen, in particular for textile materials made of natural and regenerated cellulose, in red shades.