There are two reasons that I know of:
One is it's just more fat than normal in your plasma which may be caused by too fatty diet or some kind of diseases or disorders such as kidney dysfunction, gallbladder removal,...
The other reason: When your blood undergoes hemolysis (destruction of red blood cells)due to one or more of a variety of possible causes, hemoglobin from dead cells are released into the plasma and wouldn't suspend as normal red blood cells when the blood is centrifuged. And those hemoglobins are what causes your blodd plasma to be pinkish.
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Blood plasma may turn pink due to the presence of hemolysis, which is the breakdown of red blood cells, leading to the release of hemoglobin. This can occur as a result of improper handling of the sample, such as rough handling during transportation or prolonged storage. It is important to recognize this change in color as it may impact test results and indicate potential issues with the sample.
Because the colour of the blood vessels that cause your eyes to turn red are red.
Helper T cells (Th2 cells) play a role in activating plasma cells, which are responsible for producing antibodies. Helper T cells release cytokines that stimulate B cells to differentiate into plasma cells and produce specific antibodies against pathogens.
It will be the simple ageing process of the flower.
Stomach acid is acidic, so litmus paper would turn red when exposed to it.
Phenolphthalein would turn pink when added to Drano, which is a strong alkaline substance. This color change indicates that the solution has become basic.