Gray symbolizes trauma and emotional numbness, while intense colors symbolize positive emotions and psychological health. In that context, Catching’s speculation that everyone has “their own way to get their colours back” means that everyone heals from trauma, grief, and so on in their own way: there’s no one-size-fits-all healing process. In Catching’s case, she needs hope to heal, but she believes that the abuse she has suffered has compromised her ability to hope.