Thanks Rosanna. I know that the first bakelite (discovered in 1909) appear after the first great war, approximately. The bakelite on the first pics is the oldest. I estimate perhaps 1960, perhaps!!! and the last picture where the beads are very yellow are, in my opinion, very recent.
On 1990, the peul women wore many "amber" beads, it was the wealth of a family, like on the pic with the young woman for the marriage, but, the drought has arrived, and the Peul people have sold their beads. It was terrible. And now we see few women with amber. It was so beautiful!
The merchants are still trying to make believe that they sell amber but it is no more amber, today, in Africa, or very very rare. It is also the same with old glass beads. The beads are coming from China, India, but the old beads are very rare.
Good afternoon (I hope, you understand my english!!!)