okay so swim recieved his fumaric acid - 300 g for free - but has 2 different kinds. here are the first 3 pages of the info that accompanied it - there are 7 more pages but they are not specific on the solubility - there just for all fumaric acid. if anyone wants them il ask swims friend to ask swim to scan it.
here are the pix - hopefully they should be enough to get an answer to this question -
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