Even Zhang Yanhang's crude forging technique was certain to pose no issue, as the material's quality was there for all to see, and green quality was the baseline.
No matter how Zhang Yanhang forged, even if he crafted a pockmarked, broken sword, that pockmarked, broken sword would still hold the original material's value. Just one melting down, and it would immediately revert to green quality Crimson Iron.
Therefore, rather than fusing two white quality weapons, it would be more beneficial for Zhang Yanhang to forge two green quality weapons with Crimson Iron and then fuse those. If he did that, the gains would be much higher than fusing white quality weapons.
So, although the green quality Crimson Iron Ring seemed to be of little use, Zhang Yanhang still chose it, mainly because he was interested in the ring's Additional Attributes.
[Crimson Iron Ring]
[Quality: Green]
[Type: Equipment]