What is the reference to red and gray.in Grapes of Wrath?

In "The Grapes of Wrath," the reference to red and gray symbolizes the contrasting experiences of the characters and the harsh realities they face. Red often represents the earth, vitality, and the struggle for survival, while gray symbolizes despair, oppression, and the bleakness of their situation. This imagery highlights the tension between hope and desolation as the Joad family navigates their journey during the Great Depression. Overall, the colors serve to deepen the emotional resonance of their plight.