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Glass bead making has long traditions, with the oldest known beads dating over 3,000 years. [1] [2] Glass beads have been dated back to at least Roman times. Perhaps the earliest glass-like beads were Egyptian faience beads, a form of clay bead with a self-forming vitreous coating. Glass beads are significant in archaeology because the presence ...
The origins of beadmaking in Ghana are unknown, but the great majority of powder glass beads produced today is made by Ashanti and Krobo craftsmen and women. Krobo bead making has been documented to date from as early as the 1920s but despite limited archaeological evidence, it is believed that Ghanaian powder glass bead making dates further back.
Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.
The range of seed beads in most modern seed bead work covers the sizes 6/0, 8/0, 11/0, 12/0, 13/0 and 15/0. Sizes 6/0, 8/0 and 11/0 are often used in beaded knitting, as well as bead knitting. The extremely small class of seed beads smaller than 15/0 have not been in production since the 1890s and any in existence are usually considered antiques.
Polymer clay is a type of hardenable modeling clay based on the polymer polyvinyl chloride (PVC). It typically contains no clay minerals, but like mineral clay a liquid is added to dry particles until it achieves gel-like working properties. Similarly, the part is put into an oven to harden, hence its colloquial designation as clay. [1]
PMC works drying on a mug warmer. PMC was developed in the early 1990s in Japan by metallurgist Masaki Morikawa. [3] As a solid-phase sintered product of a precious metal powder used to form a precious metal article, [1] the material consists of microscopic particles of pure silver or fine gold and a water-soluble, non-toxic, organic binder that burns off during firing.