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fluid measurement

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bruncher
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fluid measurement

#181522

Postby bruncher » November 20th, 2018, 12:36 am

I have some expensive Kahrs cleaner for wooden floors which says on the label that the fluid should be diluted
1dl/10 l water (1:100)


There's also a picture on the label of 5 caps of fluid added to a bucket of 10 litres of water. There's no way that 5 caps = half a litre.

This confused me so I called the UK office of the flooring company, and they said it's 1:10 not 1:100, and the company HQ in Sweden concurred with 1:10

Why do I have a nagging doubt? Why do they even get into demi-litres, why not just 1 part concentrate to 10 parts water (if that's what they mean)? But how can that be correct if 5 caps should be added to 10 litres of water? That's definitely closer to 1:100

elkay
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Re: fluid measurement

#181528

Postby elkay » November 20th, 2018, 1:30 am

Dl is decilitre, not demilitre.
1 dl is 100 ml.
Therefore 1:100 sounds correct.
And would indicate that the cap holds 20 ml, which sounds reasonable.

Never noticed dl being used before since I was taught about it in school over 40 years ago, but it appears the Swedes must use it....

bruncher
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Re: fluid measurement

#181645

Postby bruncher » November 20th, 2018, 12:55 pm

Thank you elkay, yes my mistake re demi for deci. I have never seen this measurement on any other product, hence my uncertainty.

It's always disconcerting when you have to choose between incompatible information from the same company, but I think I'll go with the label. Better to have a weak solution that one that is too strong, concurs with the general ethical principle of 'do no harm'.

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Re: fluid measurement

#181659

Postby jfgw » November 20th, 2018, 1:18 pm

A measuring cylinder is good for this sort of thing if you want to make up small quantities. It is easy to measure 10ml to make a litre or even 5ml for a half-litre. They are available from a range of types of supplier including home brew shops. If you have a defunct darkroom, you may already have a spare one.

https://www.wilko.com/en-uk/wilko-plast ... /p/0022576 .

(If it is sold as a "trial jar", check that it is graduated - I suspect that the majority are.)

I didn't think that decilitres were used much either. There are probably a few specialised uses such as expressing the concentration of something in blood.

Julian F. G. W.


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