Can't see the point in making these for profit. Skill needed for silk cloth is 51-53 Clothcraft and the Alchemy skill needed is in the 70's range. Chances of HQ with these numbers is next to nothing and the cost of materials against selling price per stack of 30k on Fenrir currently makes this synth a total loss.
This recipe most likely requires a clothcraft skill as well. Silk cloth in clothcraft is used at around lvl 49, so you should at least have your cloth at 41 to get a successful synth. I'm gonna give it a shot, as my Alchemy is 81 now. I'll post any successful synths when I do.
Yield 1? That can't be right. Especially because they went for 500 from the fireworks people at summerfest. You would lose a disgusting amount of money with this. Oh, and a recent update made fireworks stack to 99, not 12.
You need 2 firesand not just 1. At level 70 Alchemy I can't even make this. The skill has to be at least 80 for them. The yeild is not 1, but I will tell you what it is when I made the item in ten or so levels.
*Edit... I think that the level may be right. but there is also a clothcraft element needed here.