Plant dye based hair colour composition/ kit for dyeing/ colouring the hair free of any pH controlling agent and oxidizing agent comprising selectively atleast one or more dye, plant dye, concentrated plant dye and atleast one or more inorganic metal salt based mordanting agent for generating dye/concentrated plant dye metal complex free of any pH controlling agents and oxidizing agents, which while providing for safe base colour shade of the dye, plant dye, concentrated plant dye also provides for safe modified base colour shade thereby displaying superior colour delivery and colour variance.