Serum/plasma is generally colorless or straw colored. The red pigment of blood is caused by the oxygenated haemoglobin in the red blood cells.
Some examples of pigment-producing bacteria include Serratia marcescens (produces red pigment), Chromobacterium violaceum (produces violet pigment), and Pseudomonas aeruginosa (produces blue-green pigment). These pigments are often secondary metabolites and can serve various functions for the bacteria, such as protection from environmental stresses.
Chlorophyll pigment produces green color, while carotenoid pigment produces red, orange, or yellow colors.
epidermis
Melanin
The color tube commonly used to collect serum is a red or gold/yellow top tube. These tubes are designed to allow the blood to clot, separating the serum from the other components.
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It is the fruit of the FEIJOA tree
You are removing pigment. Melanin produces pigment (colour) so you are taking out the colour. When your naturl colour grows out again you can see that the melanin is still producing the colour.
A shade of pink or peach color, depending on the ratios of yellow and magenta pigment added to the white paint.
Serratia marcescens produces a red pigment called prodigiosin as a byproduct of its metabolic processes. Prodigiosin is thought to provide protection against other microorganisms in the environment. It is particularly noticeable at room temperature as this is the optimum condition for S. marcescens growth and pigment production.
Chlorophyll. It's what makes plants colorful and produces energy.
The chloroplasts of plants. Specifically the pigment chlorophyll.