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random kitchen science tip 

Turmeric is very tasty but it can and will stain everything it touches a bright fluorescent yellow colour. But the molecule which causes that colour is broken down by ultraviolet. So if you don’t want your chopping board or wooden spoon to stay vibrantly yellow, leave it in the sunlight for a couple of hours and all the yellow will be gone.

Just make sure it’s not sunlight behind a window. That probably won’t work, because glass blocks most ultraviolet light.

random kitchen science tip 

@InvaderXan I had it on my kitchenwall (don't ask) and the stain was gone in a day. Even with only light through the opposite window 😊

random kitchen science tip 

@Julia_Schmeer Hmmmm maybe it depends on the glass. All glass lets _some_ UV through, and I'm not sure what wavelengths are needed to break down the yellow pigment. There's a chance even blue light might work, thinking about it.

random kitchen science tip 

@InvaderXan I never knew this! Thank you!

If glass blocks most ultraviolet light, does that mean you can't get sunburnt/sun-damaged skin from sitting in the light through a window?

random kitchen science tip 

@griffinkate @InvaderXan I think it depends on glass — not all of it blocks UV, which is apparent when for example book covers fade after sitting in sunlit shelf.

random kitchen science tip 

@Stoori @griffinkate It's true that different glass blocks different amounts, but all glass blocks UV-B and higher, as far as I know. Though some damage to both book covers and your skin can still happen from UV-A. I'm pretty sure it's unlikely for most people to get sunburn through glass though.

random kitchen science tip 

@InvaderXan @Stoori That makes sense. Thank you.

random kitchen science tip 

@InvaderXan Tumeric has actual clinical (not observational, not anecdotal!) trials and studies showing its benefits as an antiinflamatory and other good stuff.
However, your liver will cheerfully throw it all away before you can use it *unless* you also take some black pepper at the same time. The piperine retards the liver's ability to metabolize the tumeric allowing a 2,000% increased absorption. Ddg or qwanta...

random kitchen science tip 

@gemlog @InvaderXan I've been taking Turmeric & black pepper for ME pain for about 2 months now, and have noticed a decrease is some of the pain. Enough to make me feel it's worth continuing.

random kitchen science tip 

@InvaderXan Might that be worth a try if the cutting board is orange from carrots, too?

random kitchen science tip 

@anke I'm not sure what wavelength carotene dissociates at, but it's certainly worth a try

random kitchen science tip 

@InvaderXan omg this is such a useful tip. I'm guessing the wooden spoon that is the wooden Turmeric spoon, from many many uses, may not recover though?

random kitchen science tip 

@GwenfarsGarden TBH, it should still be recoverable even if you’ve been using it for ages. Give it a try and see if it works!

random kitchen science tip 

@InvaderXan I shall. Will report back the results :)

random kitchen science tip 

@InvaderXan oh, do you think this would work for clothing too? Asking for... *looks sheepish*

random kitchen science tip 

@GwenfarsGarden I haven’t tried it myself, but it can’t hurt to give it a go and see if it works! I don’t see why it wouldn’t TBH

random kitchen science tip 

@InvaderXan you are right, I'll just give it a go. The worst that can happen is nothing!

random kitchen science tip 

@GwenfarsGarden That’s the spirit!

random kitchen science tip 

@InvaderXan Heaps thanks!

random kitchen science tip - result! 

Based on the information provided by @InvaderXan, today I experimented.

Before and after photos of our wooden Turmeric spork (spoon-fork), after being in the sun for a couple of hours.

It works! Not that I didn't trust Xan, I just was excited to do science and see the result ;)

#fedikitchen

random kitchen science tip - result! 

@GwenfarsGarden Trying things and seeing the result is the most fun part of any science! 😄

random kitchen science tip - result! 

@InvaderXan I am so excited to have actually undertaken a scientific experiment.

I'm definitely going to try it on clothing next time I spill Turmeric on myself. Will let you know how that goes too.

random kitchen science tip - result! 

@GwenfarsGarden @InvaderXan

Everything said here about turmeric as a stain applies to the spice saffron too.

Both are flavonoids, a type of chemical found in plants, that we tend to see as yellow. As dyes, both are classed as 'fugitive' meaning there is no way chemical to fix or bind the color to the fiber molecule. Anything dyed with the two will stain, but they both fade very quickly.

random kitchen science tip - result! 

@raye @InvaderXan I'll remember this if I ever get any flowers from my saffron corms

random kitchen science tip 

@InvaderXan Thanks for this tip! It totally works.

(Made some curry last week; our plates with an unglazed decorative pattern end up all yellow on the unglazed part; this cleaned them up nicely.)

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