Faye... before you embellish dresses with precious gemstones, read the whole document. There's more to it. I think you'll be ok with rikrak.
Littlethings...polyester is allowed :)
Taken from page 41-42 of the document linked above.
(d)
The following materials do not exceed the lead content limits under section 101(a) of the CPSIA provided that these materials have neither been treated or adulterated with the additioh ofmaterials that could result in the addition of lead into the product or material:
(1) Precious gemstones: diamond, ruby, sapphire, emerald
(2)
Semiprecious gemstones and other minerals, provided that the mineral or material is not based on lead or lead compounds and is not associated in nature with any mineral based on lead or lead compounds (excluding any mineral that is based on lead or lead compounds including, but not limited to, the following: aragonite, bayldonite,
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boleite, cerussite, crocoite, galena, linarite, mimetite, phosgenite, vanadinite, and
wulfenite).
(3)
Natural or cultured pearls.
(4)
Wood.
(5)
Paper and similar materials made from wood or other cellulosic fiber, including, but not limited to, paperboard, linerboard and medium.
(6)
Printing inks that use the CMYK process (excluding spot colors, other inks that are not used in CMYK process, inks that do not become part ofthe substrate under 16 CFR part 1303, and inks used in after-treatment applications, including screen prints, transfers, decals, or other prints).
(7)
Textiles (excluding after-treatment applications, including screen prints, transfers, decals, or other prints) consisting of:
(a)
Natural fibers (dyed or undyed) including, but not limited to, cotton, kapok, flax, linen,jute, ramie, hemp, kenaf, bamboo, coir, sisal, silk, wool (sheep), alpaca, llama, goat (mohair,cashmere), rabbit (angora), camel, horse, yak, vicuna, qiviut, guanaco;
(b)
Manufactured fibers (dyed or undyed) including, but not limited to, rayon, azlon, lyocell, acetate, triacetate, rubber, polyester, olefin, nylon, acrylic, modacrylic, aramid, spandex.
(8)
Other plant-derived and animal-derived materials including, but not limited to, animal glue, bee's wax, seeds, nut shells, flowers, bone, sea shell, coral, amber, feathers, fur, leather.
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