I needed to make some room on my whisky shelf for new bottles, so yesterday I finally got around to removing the labels from my empties. I don't know if this will interest anyone, but I thought I'd share my experience of what worked and what didn't in case anyone else likes to save labels.
First I tried putting a bottle in the oven at 175F for ~5 minutes. With 4 of the bottles, the labee peeled right off with no difficulty:
Laphroaig 10 & QC
Teachers
Old Weller Antique 107
The other bottles used a different type of adhesive which heat alone didn't help with. I tried steaming a couple of other bottles, but that wasn't effective either. So the remainder I soaked in hot water.
Macallan 12 came off on it's own in the water.
I didn't have a razor blade, so I used a knife to gently slide the label off the bottle with the others:
Highland Park 12
Cragganmore 12
Auchentoshan Select
Tamdhu 10
Glenfiddich 12
Powers Gold Label
Black Bottle
J&B Rare
The most difficult were:
Deanston 12
Bowmore Legend
Glenmorangie 10
Johnnie Walker Black
These might have worked better if I'd used hotter water or soaked longer, but I got them off with minimal tearing anyway. In the case of the JW label, the glue didn't seem to weaken at all, so I ended up tearing the front of the paper off the backing.
In most cases I imagine a bottler will use the same paper and adhesive type for all expressions from a distillery, but I listed the specific bottle I was working with in case there are differences.
If anyone has a better approach than I've used, or had success with specific bottles, I'd love to hear it.

