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The three most common types of markers used today are RFLP, RAPD and isozymes. Of the three marker types, RFLPs have been used the most extensively.
The paint from these types of markers is not truly permanent, as it can be removed using high pressure cleaning or paint thinning solvents such as acetone. Dangers. Paint markers, and permanent markers generally, contain the toxic compounds xylene or toluene. Like spray paint, these markers give off volatile organic compounds, which can be dangerous when not used in a well ventilated area or with a particulate mask. Gloves can also be worn to avoid absorption through the skin. Solidified paint pens. Another type of paint marker is the solidified paint pen.