We're not buying the "heavy calcium oxalate" tag for Viola. Gibbons does not caution on it for Viola though elsewhere he does caution for other plants. The vinegar dissolves calcium oxalate, though we wonder what it does to all that marvelous vitamin C. In addition, James Duke does not even list calcium oxalate in Viola (Duke's Phytochemical and Ethnobotanical Database). Two supporting articles for our argument are here:
Oxalate / Calcium
[Prevention of the recurrence of urinary lithiasis: mineral waters with high or low calcium content?]. - PubMed - NCBI
www. (ridiculous URL) type in "Key to Preventing Calcium Oxalate Stones is to Get the Right Amount of Calcium."
Oxalate / Calcium
[Prevention of the recurrence of urinary lithiasis: mineral waters with high or low calcium content?]. - PubMed - NCBI
www. (ridiculous URL) type in "Key to Preventing Calcium Oxalate Stones is to Get the Right Amount of Calcium."