Figure 5.
The visual appearance of the films: (A) pure PLA film (B) 0.025% PLA/melanin film (C) 0.05% PLA/melanin film (D) 0.2% PLA/melanin film.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.