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I doubt it. Define "quite a lot". I agree the frequency is not the only indicator for speed but it can be measured, that's an advantage for comparison and it's a simple and fast method. In your approach you also have non-measurable indicators depending on your subjective impressions. But if it...

That's what I did. But his post described what he does in 2025 so I still don't see the connection to 1970.

Do you read out of Lazer's post that he intended to determine a blade's speed in 1970?

Er, nope ... but maybe you can enlighten me?

Yep

Why not simply measuring the new blade's frequency?

What exactly do you mean with "light"? The blade only or the whole racket? Did you measure the weight of the blade only? If yes, how heavy was it?

Yes I boosted a 157 x 150 mm sized rubber 3x with very thin layers of Haifu National White and the weight increase was 4 g.

The last two, Haifu Yellow and Seamon, show absolute identical absorption curves. If - as you say - the only difference between those two is the yellow dye in the Haifu Yellow, then the absorption curve for Haifu Yellow absolutely must be different. As both curves are the same, something stinks ...

Have you done the spectroscopy yourself or do you have a source of that information?

I think so, too, but as you don't know what exactly Haifu contains, I guess, you cannot make any conclusions re its chemical reactivity, no? To me Haifu contains something which just supports the longer stay of the rubber softness and as Haifu is thicker the Haifu oil doesn't evaporate so fast...

Yes, right, but I didn't know if the rubber shown also came with such a sticker. Also I have never seen such irregularities in the printing with any of my DHS rubbers.

Are you sure the rubber is authentic?

Thanks. I wasn't aware of that. What about my question for you re the baby oil?

There is nothing such as "chemical absorption". If you boost with baby oil, do you also think that there is a chemical reaction with the sponge?

Yes, could be. And why would the colours still stay as is? Is it not that the colours of rubber and sponge don't change even after months of repeatedly boosting?

Correct, but it still evaporates. If you manage to measure a difference between before and after, you still don't know what has caused the difference.

And how exactly would you factor in natural evaporation of the booster?

Plus, chemical reactions always go hand in hand with decomposition of the impacted materials.

No, sorry. Really not. Please explain why the colours stay when a rubber is boosted and a chemical reaction occurs. We turn in circles so I let you stay with your misbelief. But, if you are stating things like these, you should look at the whole picture and be able to explain observations or at...