[mrjonathanr]

- stay within your local county, at most crossing one county boundary.

I presume this was included just to annoy the Sheffield residents?

Because of the dearth of decent climbing between the two counties of Yorkshire and Derbyshire? Yeah poor lambs.

Think Burbage is 'in'?

[Coops_13]

I went bouldering for the first time last Sunday and followed pretty much the same as all above. Was by myself for most of it and met up with a partner later (only person I'm going to be climbing with for a while). At one point there were other people at the craglet, but we both kept to problems > 6ft apart. Was definitely more cognizant of riskier boulders or being seen to be doing something risky by hikers passing by

[tomtom]

This could be calculated  as ABV (alcohol by volume) with A simple expt non? Pour some into a measure - let the alcohol evaporate and see what volume of ‘residue’ is left?

Might try with an old calpol syringe later :D

OK - the results are in.

Exec summary is 65% by volume alchol. US FDA recommends sanitizer > 60%.

Methods: I found a half decent looking 5ml syringe and a small plastic cap that held (when filled to the point of overflowing) 2ml. I filled the cap with shaken liquid chalk (the Rock Technologies stuff) to the same level as the water then left it to dry. I had to come back several times and stir/squidge it with a toothpick. By this evening it had shrunk in volume as the alchohol evaporated etc.. and I refilled the cavity left with water (using the toothpick to pop out any air bubbles).

Results: 1.3ml of water = 0.65 as a proportion or 65%.

US FDA recommends hand sanitisers with >60% ethanol - so I think we pass that limit - or are certainly close. Quite how the chalk or small amounts of rosin with the mix affect virus I don't know. Also worth mentioning that the alcohol in the liquid chalk makes the hands very dry as it evaporates. Again this may have an impact. Usual experimental error caveats.

[a13c]

Great science TT! Thank you.

[slab_happy]

Awesome, thank you for doing the experiment! Obviously replication is required, and it may well vary between brands, but it's useful to know that it's potentially in the ball park.

[tk421a]

"Thanks for your email, the Ethanol content in RT liquid chalk is between
70 and 80% and I can confirm that the product is antibacterial."

That was the response from Rock Technologies when I emailed.

[shark]

For those who don’t like liquid chalk maybe getting a cheap bottle of ethanol is an alternative to use before chalking up. It’s good for getting rid of grease too

[tomtom]

"Thanks for your email, the Ethanol content in RT liquid chalk is between
70 and 80% and I can confirm that the product is antibacterial."

That was the response from Rock Technologies when I emailed.

Excellent! My measurements were not so far off then!!

And well done for emailing them.

[tomtom]

Disappointing to see insta-spray from people who really should know better - visiting ‘esoteric’ crags with access issues clearly near peoples houses etc... Knobs.

[Stu Littlefair]

Presumably this is aimed at me? If so we can discuss offline if you like.

[Will Hunt]

In the street! 

[dunnyg]

Obviously there must be video evidence of the event, in line with current ukb rules and regulations. 

[Stu Littlefair]

I don’t even know if he is referring to me. But on second thoughts there’s maybe use in a public discussion.

TT, since the other thread is moving onto access issues I’ll post there and I’d be interested in your opinion.

[SA Chris]

Damn, wish i used instagram properly, missing all the spray..