So to say it straight DHMO's answer is incorrect. Well, since the foam is made up of lots of teeny tiny bubbles, light passing through it will have to encounter several surfaces, and it's these surfaces that scatter the light in so many directions. Now you might ask, 'Then why isn't soap water white?'. What is largely giving foam it's white appearance is another phenomenon called Scattering. While TIR can result 'white light', it is not the dominant phenomenon acting here (I'm not saying it's completely absent here either). Now goes on to mention that Total Internal Reflection (TIR) is what imparts the white color to the foam. Now if you go ahead and agitate that soap solution, it will give rise to white lather, and this shouldn't be surprising anymore. This is not unexpected, as I've already mentioned, the quantity of dye used is very small. You'll see that the soap, apart from making it more cloudy, has not visibly imparted any particular color to the water. I emphasize on "gently" so that you don't stir up a lather. Why don't you carve off a piece of colored soap (having more or less the same size as as an almond) and dissolve it a mug of water by gently stirring it. As correctly points out, the dye/pigment used to color the soap is greatly diluted. Now when you lather using soap, only a really teeny-tiny bit actually goes into the water. Now for the rest of this answer, I will assume (reasonably enough) that by 'colored' soap you are referring to soap that goes by colors other than white. Too much dye, and it could possibly stain your hands/clothes, so soap manufacturers use as little dye as possible, but just enough to give the soap a good color. Now typically when you dye anything the quantity of dye used in comparison to the quantity of the substance to be dyed is very small. Soap colorants range from various kinds of Mica to dyes found naturally in plants. I've to disagree with it in some aspects. When I did this I wasn't sure I had it right, but I've used it for a couple of days since, and it's working fine.Though answer is quite interesting, you shouldn't take it without a pinch of salt. Holding a thumb over the pins to keep the tape threaded, gently gently, gradually pull the white guide *just enough* to seat the white guide unit. Then, with the flat side of the white guide unit in contact with the SHINY side of the unused tape (make sure you've got this right!), seat the tape onto the white guide unit such that it runs through the set of guides on each side of the guide unit. The used waste tape runs along the inside of its pin in the same orientation as the unused tape, and winds straight onto its take-up reel. The unused tape comes straight off its reel onto the slanted side of its pin, then rolls 'onto its back' to move flat through the white guide unit. Seat the tape onto the pins as in the photo above. Fear not - you will extend this in a bit. Wind up 'a bit too much' tape, so there is not enough slack for use. Lift out the blue disc holding the reel of unused wite-out tape. Remove the white guide-unit from the case.Ĭarefully remove the tape from the white guide-unit. This is all in one 'step' because you won't be able to navigate once you get started.
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