Re: dug me some bottles...YESSSSSSSSSSSSSSSSSSSS.... or was buried for a reason?
First thing's first... I'm not recommending that you dispose of this stuff yourself.
Personally, I think the place you dug up was more likely a textile mill than a photography studio.
con acid hydrochloric = Concentrated hydrochloric acid. Nasty stuff. To get rid of it, pour it into water. DO NOT POUR WATER INTO IT. It reacts like if you pour water into hot grease.
hydrogen sulphide - This stuff is pretty much sewer gas, and can be fatal if inhaled. It will also explode. This is one for hazmat to take care of.
con acid nitric = Concentrated nitric acid. Also really nasty; it burns, it's toxic. You can take care of this the same way as the hydrochloric acid.
indigo solution - A solution of indigo and concentrated sulfuric acid. You can dilute this as well. Don't touch.
potassium iodide - a skin irritant, but pretty safe at the same time. This is what is given to people at nuclear danger spots to prevent radiation poisoning.
phenoiphtalein - ever seen CSI? This is the chemical they use to detect the presence of blood (first the area is swabbed, then alcohol is applied to free up the blood cells, then this chemical is dripped on, and finally, hydrogen peroxide is added. the color indicates blood). Small amounts are generally harmless.
ferric chloride - this stuff is used to etch circuit boards. It's toxic and corrosive, very nasty stuff. Hazmat this one for sure.
ether - I'll let you guess
nesslers solution - a solution of potassium iodide, potassium hydroxide and mercuric iodide. Was used to detect the presence of ammonia. Hazmat.
alcohol - duh.
potassium ferrocyanide - A chemical used in conjunction with blue dies. See the cyanide part? Hazmat.
silver nitrate - We used to dilute this stuff in chemistry and stain our hands black (silver naturally turns black with light, it's a reaction that's very important in photography). Of course, it was quite diluted. Even a small quantity of undiluted silver nitrate can kill you.
ammonium sulphocyanide - an old stabilizing agent in photography. See cyanide?
lead acetate - used in textile printing and dying. It's very toxic
sodium carbonate - baking soda's big sister. used to stabilize the pH in photography and possibly printing.
sodium hydroxide - better known as lye. used in textile manufacturing.
platinic chloride - How much of this, exactly, do you have? 10 ml of the stuff runs $130. Probably because it contains platinum. It's a skin irritant, and will pretty much affect any part of your body that it touches. There may actually be some demand for this stuff.
calcium sulphate - this is used as a dessicant. It's also used in blackboard chalk and tofu. Weird, huh?
Good luck with hazmat. Once after a flood, a container of pesticide drifted into my family's yard. We called the municipal center to find out how to dispose of it, and they sent two fire trucks and three police cruisers out.