Trochus Shell
Trochus shell is a material for shell buttons made by processing the shells of sea snails that inhabit coral reef areas, with thickness and a natural luster and color variation.
Definition and Overview
Trochus shell is a natural material made from the shells of sea snails, also called trochus shell. The shell layers are cut out and polished, then processed into buttons. Based on white to off-white tones, subtle differences in color and luster may appear depending on the part of the shell.
Even among shell buttons, the appearance of the nacre, thickness, and hardness differ depending on the shell species and the area collected. Trochus shell makes it easy to obtain thicker shells, so it is used for shirt buttons as well as more substantial garment buttons.
Material and Structure
Trochus shell buttons typically have flat two-hole or four-hole shapes. There are also cat's eye shapes with recessed holes, and shank shapes with a foot on the back for threading, selected according to the product design and sewing specifications.
Because natural shells are processed, there are individual differences in color, speckling, luster, and thickness. Since it is difficult for all items to have a uniform appearance like resin buttons, it is important to confirm the color tone and look with actual samples during planning.
- Two-hole, four-hole: a standard shape sewn on by passing thread through the holes on the surface.
- Cat's eye button: a shape in which the hole area is recessed in a groove, making the thread less visible on the surface.
- Shank button: a shape with a shank on the back for threading, making it harder for the stitching thread to show on the surface.
Size Notation and Main Applications
Button sizes are expressed in millimeters by diameter, and also in lignes. Lignes are a unit for buttons; 1 ligne is approx. 0.635 mm. In orders and specifications, listing both the ligne size and the diameter in mm helps prevent misunderstandings.
Trochus shell buttons are used for shirts, blouses, cardigans, dresses, and more. Sizes range from small placket buttons to larger buttons that serve as accents on cuffs and pocket openings, and selection should take into account fabric thickness, buttonhole length, and frequency of opening and closing.
How to Attach and Handling Notes
For buttons with holes, sew them on while leaving a slight thread shank between the button and the fabric, and make a thread shank wrap if needed. When the fabric is thick or the button is used in a location that bears stress during opening and closing, preventing the button from being pressed too tightly against the fabric helps prevent cracking.
Although shell is hard, it can chip or crack under strong impact or localized tightening. For washing and dry cleaning, check both the garment's care label and the button's resistance. During finishing, do not apply a hot iron directly; use a pressing cloth or press around the buttons.
Bleach, strong alkaline detergents, and chemicals may affect the surface luster and color tone. Long periods of moisture, friction, and collisions with other hard accessories can also change the appearance, so it is desirable to conduct washing and cleaning tests on the finished product before mass production.
Differences from Similar Terms
Shell buttons is the general term for buttons made from shell, and trochus shell is one of the shell species used as the material. White mother of pearl shell and black mother of pearl shell refer to materials derived from pearl oysters, and differ from trochus shell in the shell species used as the raw material, color tone, appearance of the nacre, and thickness.
Real buffalo horn buttons are made by processing buffalo horn and differ from shell in luster, pattern, moisture absorption, and behavior under impact. Do not choose based on the material name alone; specify color, thickness, hole shape, and washing conditions in detail in the specifications.
Frequently Asked Questions
What is the difference between trochus shell buttons and white mother of pearl shell buttons?
Both are buttons made from shell, but the shell species used as the raw material are different. Trochus shell is made from the shells of sea snails, while white mother of pearl shell is made from pearl oyster shells. There are differences in luster, color tone, appearance of the layers, and thickness, so even among white-toned items, compare actual samples before selecting.
Can trochus shell buttons be machine-washed at home?
It depends on the garment's care label and the button specifications. Since shell can be affected by impact and chemicals, turn the garment inside out and place it in a laundry net when washing to reduce contact with other clothing and metal accessories. Avoid strong bleaching treatments, and perform pre-testing for mass-produced items.
How do you convert button lignes to mm?
Convert using 1 ligne as approx. 0.635 mm. For example, 15 lignes is approx. 9.5 mm. However, buttons have manufacturing tolerances, and the apparent size can also change depending on hole position and edge shape. It is important to use measured values when designing the buttonhole.
