DMC 934 to Madeira: Thread Conversion

Madeira 1505 is the standout substitute here, carrying an exact rating that Anchor cannot match for this particular shade. In the rare situation where Madeira outperforms Anchor for a green family color, Madeira should be the first choice when substitution is needed. The very dark olive-green character that makes 934 useful as a near-black green shadow color is preserved accurately, and Madeira's colorfastness at dark values is reliable.