> when apistan and checkmite came out we were told they had no residual build up as well.  has anyone done any studies to prove this.

See: Mullin CA, Frazier M, Frazier JL, Ashcraft S, Simonds R, et al. (2010) High Levels of Miticides and Agrochemicals in North American Apiaries: Implications for Honey Bee Health. PLoS ONE 5(3)

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0009754

They "found 121 different pesticides and metabolites within 887 wax, pollen, bee and associated hive samples." No organic acids are mentioned. However, many organic acids occur naturally in honey.

For example, the following acids have been found in honey:

> Acetic, Butyric, Citric, Formic, Fumaric, Gluconic, a-Ketoglutaric, Lactic, Maleic, Malic, Oxalic, Pyroglutamic, Pyruvic, Succinic, Tartaric, etc.

> Formic acid levels decreased asymptotically with time, so that 5 to 8 months after the treatment, the levels in honeys from treated bee- hives were more or less similar to those in honeys from untreated beehives.

> Several researchers have analyzed oxalic acid levels in honeys from beehives treated for Varroa infestation with this acid. The results of this research show that the natural oxalic acid content of honey is not increased by treatment with this acid 

Source:
Significance of Nonaromatic Organic Acids in Honey. Journal of Food Protection, Vol. 66, No. 12, 2003, Pages 2371–2376

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