It is not harmful to drink black tea and green tea together, and it will not produce harmful substances. At most, it just tastes a bit strange.

/iknow-pic.cdn.bcebos.com/024f78f0f736afc3b2e51514bd19ebc4b64512d1"target="_blank"title=""class="ikqb_img_alink"gt;/iknow-pic.cdn.bcebos.com/024f78f0f736afc3b2e 51514bd19ebc4b64512d1?x -bce-process=image2Fresize2Cm_lfit2Cw_6002Ch_8002Climit_12Fquality2Cq_852Fformat2Cf_auto"esrc="/n1/2016/0128/c21471-28091138.html"target="_blank"title="Only supports selecting one link to take effect"gt; People's Daily Online - There are 4 major benefits of drinking tea ?But the "tea" nature should be determined according to the physical constitution