Extracting previously vaped frames?

[Erichalfbee]

How does this vaping thing work time wise?
How long would you need to wait with the supers off?

Supers off, vape, supers back on.
Bees will pick up desublimated oxalic as they move about the hive.

 

[ericbeaumont]

as it's a one off - why not just vape the brood box whilst the supers have been removed to put the newspaper sheet on?

True.

Always a but: if robbing is likely, and perhaps several colonies with supers to be vaped, using the paper method limits exposure of supers.

 

[Erichalfbee]

Always a but: if robbing is likely, and perhaps several colonies with supers to be vaped, using the paper method limits exposure of supers.

How long is too long? I can remove supers, vape and return supers in a few minutes.
Supers off, vaping eke on top of brood, vape (20 seconds), eke off, supers back on

 

[jenkinsbrynmair]

they probably spend less time off the hive than when you inspect.

 

[Erichalfbee]

they probably spend less time off the hive than when you inspect.

Exactly