It is kind of amino acid required for the growth of variety bamboo shoots.
Every so often there are: bamboo shoots, winter bamboo shoots and Moso bamboo shoots which leads to red, orange or white spots of color, color is out of the whole, juice might become yellow, orange or white.
But these spots are tasteless and odorless and can be removed by washing them with hot water or cold water.
In addition, it does not affect the human body.