Figure 9. Alginate beads with enclosed sodium permanganate in neutral, alkaline and acidic sodium sulphite solutions (from left to right; the photographs were taken about 2 min after covering) (Photographs: Ducci)

From

Redox Reactions in Sodium Alginate Beads

Matthias Ducci

World Journal of Chemical Education. 2019, 7(2), 40-44 doi:10.12691/wjce-7-2-2