Assessing winter tyre condition

[belfry]

Is there a way to assess the pliancy of winter rubber?

I'm thinking about winter tyres that have been stored in storage bags in a utility room in a house, so not too hot or cold.

Winter tyres stored in daylight will have degraded over 5 years, but what about tyres stored in ideal conditions?

I am wondering if it's possible to assess the condition of a tyre by testing how much pliancy has been lost?

[belfry]

The reason that I started this post is because there is often a very generic approach to tyre age vs rubber hardness.

Obviously, I don't want to drive on tyres that have become hard and less effective, but I would like to be able to assess the difference in condition between a winter tyre that has been stored in sunlight for 5 years and a similar tyre that has been stored in ideal conditions.

I have found a rubber hardness scale called "Shore A" and a tester called a Durometer for about £20. This will give me a chance to understand the reduction in pliancy of the rubber over 5 years.