The black pile in the middle of the meat is the intestinal gland and sea mud part of the flower nail.

Flower armor is the flower clam, because the Cantonese language flower clam and flower armor is the same sound, the flower clam is written as flower armor. Its intestinal glands usually contain food that is not yet fully digested by the flower armor, as well as metabolic wastes. At the same time, since the flower nail lives in the sea, it will inevitably have some sediment in it. All these will make the flower nail peeled with black material. These intestinal glands may contain some heavy metals in addition to undigested food residues, so the black sediment part is not directly edible and needs to be treated.

The structure of the flower nail is relatively simple, generally except for the hard shell and viscera of the flower nail, as well as the sediment in the middle can be eaten. So after you buy a flower nail, make sure you clean it, especially the sandy part in the middle of the nail.

Flower armor morphological characteristics

Smaller, shell surface color is generally yellowish-brown, shell surface dark pattern similar to the text but have a sense of concavity. The color is dark, the pattern becomes larger, with black, brown, dark brown, dense color or russet composition of spots or patterns.

Flower clam, also called flower clam by Chaoshanese, is a culture species developed in Chaoshan area in the last decade. Its scientific name is miscellaneous clams, shell nearly ovoid, pointed oval at the front end, blunt oval at the back end, shell surface dark yellowish brown, covered with "human" or fire tongue dark brown pattern, shell surface from the top of the shell to the ventral edge of the fine radial ribs. The shell surface has fine radial ribs from the top of the shell to the ventral margin. In general, the shell height is more than 2 centimeters, and the shell width is nearly 4 centimeters.