Failure: Butterick B4443 Special Occasion Dress

ワンピース、完成したんだわ。
でも大失敗作となりました（泣）
なぜなら

What can I do with this rubbing mark right in the middle of the chest?

仕上げにアイロンをかけていたら、アイロンからぴゅっと水が飛び出してワンピースの身ごろのど真ん中に着地。それを拭いたら布に跡が出来てしまいました。
胸の真ん中で、隠しようがありません。
手洗いしてみたものの、変りなし。
光の当たり具合によってはもう言い訳できないぐらい、そこだけぴかぴか光っています。

前回のワンピースと同じ型紙を使ったにもかかわらず、難しい布を使ったおかげで何倍も時間かかったのに、結局着られないものになってしまいました。
それも前回のフィット感がイマイチだったところを改良して、かなりいい出来だっただけに、ここ連日１２時ぐらいまで作業していただけに（普段は９時就寝）、ショック大きすぎ。

So my Butterick B4443 special occasion dress is finished.
However, it was finished as a big failure...

I finished it, hem and all. I made some changes from the previous version and my back was fitting much better and I was so happy. However, as I was ironing for the last time, well, to be honest, I wasn't even ironing at that time, I was just using vertical steam, and a big droplet of water jumped out of the iron and landed right in the middle of the front bodice.

I was struggling with the water stain with this silk fabric earlier, so I rushed to wipe it off. And I wiped it off probably too much too forcefully that it left a rubbing mark on the fabric.

I tried to spot clean it (and made it worse with water stain); I tried to soften fabric with vinegar solution; and I even handwashed the entire garment. Yet the mark is still there, right between my bust points.

It looks worse depends on how the light reflects and in a slightly dark room with indirect light, which is exactly what it would be like in a party environment where I was going to wear this at, it looks terrible.

After sewing until midnight every day this week (my usual bed time is 9), after all the hand-basting (fabric with underlining, then every single pieces were hand-basted before put them under the sewing machine because they shifted so much without basting), my disappointment is so big right now.