Abstract: An implement for writing on an absorbent or porous surface as provided, said implement including a writing or marking tip and said implement containing a writing medium, wherein said writing medium comprises an ink composition including:a first colorant,a second colorant anda vehicle,said first colorant being dispersed throughout said vehicle and having a particle size sufficiently large so as to substantially not permeate or be absorbed into said writing surface andsaid second colorant being dispersed or dissolved throughout said vehicle and being capable of substantially permeating or being absorbed into said writing surface and diffusing into the area on said surface proximate to said writing,whereby writing applied by said implement to said surface includes an inner portion of said first colorant bordered by substantial outer portions formed by said second colorant.