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David you asked
 
>What is Homasote (Tentest)?
 As I understand it from a building supply dealer:
 tentest is now a generic name for a very light weight fibre board about .5
inches thick.  It has been made for decades.  It can be used for this
treatment but disintegrates quickly when soaked in acid.
Homasote is a trade name for a denser fibre board that will take longer to
absorb the acid but lasts longer.  It also costs about 3 times as much as
tentest. i.e. about $30 here in Toronto.  It is used as a floor underlayment
where good insulation properties are required.
Do not confuse either with the thin pressed fiberboard generically called
hardboard here in Canada,  I understand that both tentest and Homasote are
made in the US so building suppliers there should be able to help you.
 
>I never used formic acid as a treatment.
>I am new to beekeeping. I would appreciate any information you know about
>the concentration and the method of using formic acid.
Dr. Medhat Nasr's researched formic acid treatment has been discussed
somewhat on BEE-L so check the logs.  If you are stuck - email me directly
(see below) and I should be able to respond directly to you in about one
working day.  I will be glad to help but would rather not bore everybody.
 My offer goes to anyone else as well
 
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