Application of hair-coloring compositions

An application device for applying hair-coloring composition, comprising:

• a device body, comprising:
• a reservoir comprising a piston;
• said reservoir configured to receive a first part and a second part of a hair-coloring composition;
• a stirring mechanism comprising a flexible, collapsible impeller;
• and
• an electric dispensing mechanism associated with said piston;
• said dispensing mechanism configured to, upon activation, sealingly move said piston along with said collapsible impeller inside said reservoir;
• and
• an application cap comprising a plurality of projecting tines;
• wherein said flexible, collapsible impeller is configured, in an uncollapsed state, to mix said first part and said second part of said hair-coloring composition to form a mixed hair-coloring composition;
• wherein said application cap is configured for reversible-connection with said device body such that, when said application cap is connected with said device body, said reservoir is sealed from the outside except channels of said plurality of projecting tines which are in fluid communication with said reservoir;
• and
• wherein said dispensing mechanism is configured, when activated, to move said piston, along with said collapsible impeller, towards said plurality of projecting tines thereby pushing said mixed hair-coloring composition to be uniformly dispensed through said plurality of projecting tines, with said flexible, collapsible impeller being configured to move to a collapsed state upon contact with a surface of said application cap, further enabling the dispensing of the mixed hair-coloring composition.