Extended Data Fig. 1: Instability of tartrazine solutions.
From: Achieving transient and reversible optical transparency in live mice with tartrazine

a, Pure tartrazine solution after 96 h at room temperature, featuring complete precipitation. b, Pure tartrazine solution after complete precipitation, followed by 10 min in an 80 °C oven to redissolve the precipitates. c, Tartrazine/PVA solutions after 96 h at room temperature, featuring complete precipitation. d, Tartrazine/PVA solution after complete precipitation, followed by 10 min in an 80 °C oven to redissolve the precipitates.