If you try making any, be sure to use a fine screen to keep the maggots out. It gets real digusting real fast if you are not careful. Use phosphoric acid, not HCl. The results are much better. Anyone that says otherwise, post your personal results, not something that was trolled in off the internet, published papers are allowed of course.

100C is 212F, why would anyone boil fish guts? Never mind, I withdraw the question.