Brining up another old topic...
Once again, I left questions unanswered... I'm a terrible admin, I am.
Sir Nelson wrote:Did the resulting 'white' HPB bricks have any odor, or distinctive feel to them? You mentioned that it needed to be in a dark environment... I wonder if the container was exposed to light/heat, what would the impact be?
Hydrogen Peroxide is inherently odorless, and so were the bricks. The hydrogen peroxide was also not concentrated enough to do any sort noticable physical damage to the bricks to change their surface texture or ability to be built with.
Hydrogen Peroxide is not only reactive to air and water, it is so unstable it reacts to light. Exposing the container to light and/or heat would simply reduce the Hydrogen Peroxide into its two, more stable sub-components: water and oxygen. In short, nothing would happen to the bricks (aside from getting wet).
Where's the object, method conclusion etc? Sheesh! Didn't you learn how to write up experiments in Grade 5?
But seriously, what concentration of hydrogen peroxide did you use? I believe it comes in different percentages does it not?
I did go to regionals once, in the science fair...
I used the normal, over the counter 3% solution of Hydrogen Peroxide, the same concentration any Joe off the street can purchase. A user on Bricklink just recently posted about using a stronger concentration of 35% (which is what reminded me of this thread) doing the same job to white bricks in 4 days instead of a month. Getting 35% H2O2, however, is a bit tricky.
venvorskar wrote:Interesting method. Where did you get the idea?
The same bricklink user from Question 2 first started a thread about using 3% H2O2, comparing it to using a bleach solution. The findings from that was that the bleach worked faster, but the H2O2 did not damage the bricks if left unchecked for too long. Using a half water half bleach solution, after a week or so, the bricks are at risk of being chemically damaged (and so I like the H2O2 method).