1) You smell the cats' litter box and wonder if you can extract the urea from the clay and use it as a reducing agent.
2) You look at the plastic hose attached to your hand-held shower head and think it might make a good resist for tesuji.
3) You start trolling the internet for a hundred-quart or larger stainless steel kettle to use as a dye vat.
4) You consider trying to cultivate indigo or woad in your backyard.
5) You imagine that it wouldn't really be that hard to install running water, heat, and industrial grade ventilation in the garage, so that you can turn it into a year-round dye studio.
6) You decide there's no better reading in all of world literature than the entry on "Dyeing" in the 1792 edition of the Encyclopedia Britannica.
7) You do your first stoichiometric calculations in almost 30 years and start pricing pH meters and balances accurate to 0.001 g.
8) You stay up past midnight because you found an article in the Indian Journal of Fibre & Textile Research on the chemical conditions for dyeing synthetics with indigo.
9) You watch Youtube video of a shibori craftsperson tying bazillions of tiny kanoko knots at lightning fast speed and think, "That looks like a good idea."
10) The following sentence makes perfect sense to you: "I'm not obsessed with indigo, I just can't think about anything else."
Feel free to comment and add to the list!