This seems to be a contributing factor. The last extract pulled with Na+ cation resin became blue after a few days (see picture below).

This could make sense since Na+ has more affinity for the resin compared to H+. Therefore, it colluld be more difficult for psilocinH+ to be exchanged by Na+. However, I did not keep track of the mushroom/resin ratio so I can't say for sure.

The resulting powder from the Na+ resin pulls is weak but seemed active. It could simply be that more pulls or simply more resin is needed.

Next, will do tests using more Na+ resin while pulling to see if it can pass this blueing check.

Na+ would be the ideal cation resin to use since pH adjustments are straightforward. I think we need it if this ever becomes a practical mushroom extraction method.