硫化 りゅうか変色 へんしょく

ryūkahenshoku

1. Not sulfur discoloration.; Not sulfide discoloration.

1. Was sulfur discoloration.; Was sulfide discoloration.

1. With sulfur discoloration; Due to sulfur staining

1. Sulfidation discoloration; Sulfidic discoloration

1. It is not sulfur discoloration.

1. It's not discoloration due to sulfurization.; It's not a change in color due to sulfur.

1. Was sulfur discoloration.; Was sulfide discoloration.

1. Sulfur discoloration.; Color change due to sulfur.

1. It is not sulfur discoloration.

1. Wasn't sulfur discoloration.; Wasn't a sulfur-induced color change.

1. Probably sulfur discoloration.; Probably discoloration due to sulfurization.

1. Was not sulfur discoloration.; Was not a change in sulfur coloration.

1. Wasn't discolored.; Wasn't sulfurized.

1. Probably discoloration due to sulfurization.

1. Was not sulfur discoloration.; Was not a change in sulfur coloration.

1. If/when it discolored due to sulfurization.; If it had discolored due to sulfurization.

1. If it were sulfur discoloration; If it discolored due to sulfur

1. If/when sulfur discoloration occurs; If/when sulfidation changes color