Do you have any idea/info regarding persistence of pigment of serratia marcescens?

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Ned Arnnie Dagala

You might find an idea in these links I provided.

I hope this helps.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC380817/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC316084/

Francisco Solano

It depends on the nature of the pigment. Melanin-like pigments do not fade easily.

See: Brown pigmentation in Serratia marcescens cultures associated with tyrosine metabolism. Canadian Journal of Microbiology, 1989, 35(11): 1037-1042