A hair dyeing agent, a combination of the hair dyeing agent and a softener for dyeing hair and the method of using the combination are disclosed. The tubular wall delimiting the interior has at least one deforming entity and the cup includes an outer sleeve that at least partially surrounds the tubular wall, in which the outer sleeve is cohesively joined to the tubular wall in a first region above the deforming entity and in a second region below the deforming entity. And finally, the invention relates to one-pot enzymatic synthesis of aspartame from N-formyl-L-aspartic acid and L- or D,L-phenylalanine methyl ester involving an enzymatic deformylation reaction simultaneously with an enzymatic coupling reaction, as well as to one-pot di- or oligopeptide synthesis by simultaneous enzymatic coupling and deformylation reactions in general. An optional alarm may be mechanically attached to the enclosure configured to activate when one or more of the environmental parameters exceeds their defined margin. In one example, the brush attachment comprises a longitudinal twisted wire spine. It is a two piece system joined together comprising a flexible plastic designed in a specific shape with an additional flexible panel.