My days of knifing people are over . ( What can I say ? I ’m on my third strike . ) But when I get nostalgic , there is a direction to make fake knife slice on a person that see material . And better yet , you may use it so it appear right as you draw a ( fake ) tongue across a person ’s skin , too .
First , get some potassium thiocyanate , or KNCS , and amalgamate it with water — a few Gram in a few millilitre will do . Next catch some smoothing iron nitrate , or [ Fe(NO3)3 ] , and put that in a freestanding container of water . Keep the two containers and stirring implement strictly separate . Paint your arm or bridge player with the K thiocyanate answer . Dip a tongue in the iron nitrate , and then draw the knife lightly across your arm .
https://www.youtube.com/watch?v=vpQWk39cJXE

Neato , huh ? Here is what ’s going on : When the atomic number 19 thiocyanate bump off the water , it separates into a positively charged potassium ion ( K+ ) and NCS- . The branding iron nitrate separates into a triply cocksure Fe+3 and three separately negative sets of NO3- . The potassium and the NO3- we will never hear from again in this clause . However , the negatively charged NCS- and the positively commit Fe+3 , get together and shape FeNCS+2 . This is what makes the root blood red . Many people recognize iron ( Fe ) as what makes our hemoglobin bright red . Essentially , we ’re institute out the red in iron , but finding a way to do it without the hemoglobin .
There is a complicate agent here . The Fe+3 ion on its own is a light scandalmongering color , and the two component of our fake blood line separate as well as trust . What we ’re seeing is a group of chemicals reaching an equilibrium , and that vestibular sense can convert . tally some dot , for example hydrochloric acid , and the iron gets snatch off from the FeNCS+2 , annihilate the red colour and turn over the solution exonerated or very light white-livered .
If you ’re a chemistry nut or a repugnance grind , you could screen different pH level to see what will plough the solution red , yellow , and red again . But perhaps , if you ’re using hydrochloric back breaker , do n’t quiz it out on your skin .

[ ViaChemical Equilibria , Magic Wound . ]
ChemistryScience
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