Below is a photo I took of four different brands of yellow string. In terms of hue, they go from most-greenish on the left to least-greenish on the right. The two on the far ends are unknown brands. The two in the middle are YYSL Type X and Knot Bad respectively.
I know this is a long shot, but does anyone recognize the string on the far right, just on the basis of how not-greenish it is? I’d like to get more, but I have no idea what brand it is or where to find it. In fact, I don’t even remember how I acquired the two strands I currently have. They may have come packaged with a BST purchase for all I know.