I recently demolished my base because it had grown into a knotted mess (and I wanted an excuse to set up a roboport network).
I realized post-demolition that I have around 100k green and red science packs, and that I only need another 32k of each to finish all the remaining research (I still need ~20k of the blue and purples though).
Is there any use for my remaining ~70k red and green packs? Can I get materials back from them? Are they worth keeping for anything?