Observe its characteristics: high-quality fish glue is large, thick and dense, with neat edges and uniform thickness, and the older it is, the more precious it is; Pale yellow in color, clean, shiny, translucent, bloodshot and sticky; The thickness of inferior fish glue is uneven; The color is dark yellow and dull, and there are purple-black blood clots, residual holes and black spots on the board.

The most basic feature of red-billed fish glue is that there are two lines on both sides of the fish glue like the back, which is not available in other fish glue. This can be used to judge whether it is a red mouth.

What's the difference between old and new fish glue?

From the appearance, the new fish glue is white and transparent, while the old fish glue tends to be dark yellow, wrinkled and full of cracks.

From the taste point of view, the new fish glue tastes sticky, while the old fish glue is not sticky at all, and it becomes thick when cooked, even more than a centimeter, just like eating muffins.

The most important thing is that old fish glue does not hurt the spleen and stomach, is easy to absorb and is relatively more nourishing.