The number of heads refers to the amount of glue with uniform size in a catty, and it is graded accordingly. The smaller the number of heads, the larger the size of a single glue, for example, 60 heads, which means that there are 60 glues of similar size in a catty.
Common glue in the market are yellow croaker glue, sole glue, grouper glue, millet glue, cod glue, red-billed fish glue, spider fish glue, fighting lake fish glue, Zorro fish glue and so on. Different varieties of gum have different tastes.
Yellow croaker gum, Ma You gum and sole gum are soft and smooth after stewing; But grouper gum and red fish gum are more resistant to stewing, and the taste after stewing is tough and chewy; Huanghuaguan and sole gum (male and female) are popular varieties in the market now.
The variety, size and year of fish glue are different, with slightly different efficacy and different prices.
Selection method of high quality shellac
1. Look at the color: choose normal fish glue with amber surface and uneven color. The color distribution is uneven, and the whole color is amber or dark yellow. If it is too uniform, it may be bleached.
2, look at the lines: choose normal fish glue with lines and nature, the surface has natural lines, fake fish glue is smooth without lines, the lines poured out with broken glue are messy, the color is dark and the transparency is poor.
3. Smell: The fish glue without special taste or slight fishy smell is made by drying, and it has fishy smell, but it will not have other smells (pungent smells such as oil and acid).
4. Fracture hardness: Do not choose fish glue that is easy to bend. After drying, water loses a lot, so it is hard to bend by hand, while fake or inferior fish glue is easy to Bai Wan.
5. Look at the section texture: section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section section.
6. Look at the center color: If the center is turbid and opaque, don't choose it. When the fish belly is dry, the central part is not completely dry, and all around it are transparent, but the center is jade white and the color is turbid. This kind of fish belly is called "flower heart fish belly", and its quality is very poor, so it is not suitable for selection. This fish glue has a strong smell after foaming, which is a sign of identification.