Hello again!
Yes, Amanda, vegetable ivory buttons were among the first to intrigue me -- they're very tactile, and the material takes dye in a way that results in some great colors.
Vegetable ivory comes from the nuts of certain species of palm trees that grow in South America and on some Pacific islands. If I have the story straight in my mind, the nuts were originally used as ballast in ships in the 19th century, so a lot of them ended up on docks in the UK. Some enterprising soul decided that was a waste and it was discovered that the nuts could be carved much like ivory. The natural nut is a creamy to buttery white on the inside, with darker brown "bark" that is sometimes incorporated into the design of the button.
As time went on, it turned out that vegetable ivory was well-suited to any number of working methods -- machine pressing, turning, piercing, etc, and took finshes well. One problem is that the dyes used in the early days (I would guess up till about WWI) were not very stable, and those buttons have mostly faded to various shades of gray and brown by now. Dyes used in the 20's and 30's seem to be much more stable, and it's possible to find VI buttons in vibrant colors with great art deco designs.
After WWII, with the arrival of plastics, which were even more versatile, durable and affordable, the use of VI for buttons all but died out. There has been a recent resurgence, though, as people have discovered that it's a great renewable resource that offers some true opportunities for equitable trade. I know of a guy in California who employs (on a very small scale) Micronesian ivory carvers who were put out of work by the international ivory ban to carve some fantastic modern vegetable ivory buttons. I also enjoy going to a couple of the chic craft/sewing stores in Paris to see their new collections of vegetable ivory buttons -- they use modern techniques like laser etching to create some stunning designs.
The link below takes you to the first tray of vegetable ivory buttons I ever entered in competition at the National Button Society's annual convention. (I won second place, which was considered quite an achievement for a new collector!)
Some of the interesting buttons...
An Hermès vanity button, pressed with their logo.
Silver pearlized finish
Modern laser etched design of a pansy
VI mounted in metal with a paste embellishment
A handcarved lion door knocker (a "studio button", made specifically as a collector's item)
Hand painted Latin American button
Button with shell inlay
Face button with bark, paint and moveable metal earrings!
VI frame with velvet center
White metal on VI
Art nouveau stencil
Pierced
Yellow metal in VI frame
http://smg.photobucket.com/albums/v51/matthewenbray/?action=view¤t=myvitray2006.jpg