Conium

A bit late, but i dyed the pants with dark blue textile dye, and it worked, beyond expectation! All stains are gone, they look as good as new, except they're marine blue, but its a real nice color, most of chino pants are beige/brown anyway, its nice to have a dark pair. Thanks for the advice!

So i spilled HCl on my brown chino pants, not while wearing them. They are still intact without visible corrosion or holes, fabric is intact. Sad part is that the parts of the pants the acid soaked is now permantly discoloured, with light red stains. What does HCl do to the brown pigment to make it red? Chemical reaction with lightabsorbing aromatic pigments that changes its structure and therefore absorbtion spectrum? This might sound really minor, but i really liked those pants, they fit me like a glove. When it happened, i soaked them ASAP in a bucket of cold water, then washed the pants in the washing machine. The stains are still there, unchanged. The dye of the pants itself seems to be changed. No holes though, the fabric is intact. Is there anyway to reverse the process and turning them brown again?

http://pipeline.corante.com/archives/2008/02/26/sand_wont_save_you_this_time.php

I'm studying chemistry at the university, this is my first term, so my most dangerous stuff doesn't really compare to what some here have experienced. So far the most dangerous stuff im about to list, i've encountered in my current course, which is a organic chemistry course. The most dangerous: Methyl iodide (CH3I) Bromine (Br2) Aniline (C6H5NH2)

I have a small question: I know the standard electrode potentials of reduction for Ti3+ and Ti2+ to Ti-metal, which is surprisingly low (lower than Zinc even!). But i can't find the same values for the same process with tungsten (W). Which metal is most "noble" of W and Ti? The reason i wonder this is because i was discussing with a friend who has a ring alloyed with both metals, and he claims that titanium is more noble. Ti resists corrosion because of a passive layer of Titanium oxide, similar to aluminium, but in terms of reduction potential, titanium is very "un-noble". If it wasn't for that oxide layer, titanium would corrode very quickly in normal conditions. My intuition tells me W should be more noble (chemically, as in less electropositive, higher reduction potential in formation of metal), does anyone here know for sure?

Hydroflouric acid (HF) and potassium cyanide (KCN). The hydroflouric acid was used to scrape the surface of a small glass plate used to measure surface tension. The HF was very diluted though.. The KCN solution i came across when i was doing a lab about metal complexes.