If you can get a tiny bit of light, even just a couple spots, you've got something to work with. [substeps] The light in a glow stick is caused by a reaction between two chemicals.
[header] How to make glow sticks glow again [title] Find a little extra light. [step] Crack the glow stick down every bit of its length. If no light at all appears, your glow stick is completely used up and there's no hope for it.