2023-07-05|Sunatori's Anti-Bleaching Bleach

Potential Discovery or Invention

My professional artist daughter Véronique is building an apparatus to make urine drinkable. Urobilin (C33H42N4O6) is the chemical primarily responsible for the YELLOW colour of urine. The filter can only accommodate solid, preferably mixed with sand or with activated charcoal (C). Bleaching powder could be calcium hypochlorite (Ca(ClO)2), calcium hydroxide (Ca(OH)2), calcium chloride (CaCl2), sodium percarbonate (Na2H3CO6) or oxalic acid (C2H2O4).
In order to test the feasibility of using chlorine (Cl) for this purpose, genuine human urine is put into a beaker, and Javex (Eau de Javel) is poured onto it. Here is the colour change from BEFORE to AFTER the addition of the liquid. Instead of bleaching, urine's colour changed from bright YELLOW to bright ORANGE by sodium hypochlorite (NaClO).
When sodium hypochlorite (NaClO) was poured into YELLOW food colouring, bleaching action occurred.
However, when sodium hypochlorite (NaClO) was poured into GREEN food colouring, no bleaching action occurred. Instead, the liquid changed from bright GREEN to bright BLUE, confirming that YELLOW was bleached out in subtractive RYB (Red, Yellow, Blue) colour model.
Urine was passed through activated charcoal (C) filter in these BEFORE and AFTER images. There is slight lightening of YELLOW colour, but it is not quite effective.
Neither liquid hydrogen peroxide (H2O2) nor solid sodium percarbonate (2Na2CO3•3H2O2) was effective for decolourising urine and YELLOW food colouring.
The only promising method of urine decolourisation is a reverse osmosis machine for hundreds of dollars.

Water Source: Municipal tap water, sweat, rainwater, spring water, lake water, river water, urine, etc.