Autumn varroa treatment

Erichalfbee · Nov 2, 2017

Try it outside somewhere?

Eyeman · Nov 2, 2017

Fritillary said:
Yes I've been wondering about this too - not exactly subliming then is it? Tho it does seem to go on and produce the fumes... and then I've seen powdery deposit below afterwards.

When using the blow torch vapouriser you do see the OA bubbling away in the canister. It's usually when the wind is blowing and the temp drops. Using a passive varrox the OA must 'boil' each time you use it as the varrox starting temp is cold.

drex · Nov 2, 2017

Most oxalic acid is oxalic acid dihydrate. Each oxalic acid molecule has two water molecules. As it is heated the water boils off, hence it becomes liquid, and then the OA sublimates, releasing the vapour.

Eyeman · Nov 2, 2017

drex said:
Most oxalic acid is oxalic acid dihydrate. Each oxalic acid molecule has two water molecules. As it is heated the water boils off, hence it becomes liquid, and then the OA sublimates, releasing the vapour.

That's what the books say. At times the OA looks like goes through a liquid/boiling phase- at least that is what I see when I look into the canister.

jenkinsbrynmair · Nov 2, 2017

charlievictorbravo said:
My vaping setup was intended to be similar to yours but on initial use, the vapouriser burned a large brown mark in the middle of the monitoring board.
CVB

Make a meta sheet to fit for sublimating, problem solved

charlievictorbravo said:
my Api Bioxal being damp and it boiling over before sublimating

If it is actual apibioxial that will be the sugar melting and boiling over.

Never had an issue with Oxalic dihydrate boiing and spilling over the edge of the varrox pan - either spread out or heaped in a pile