Lumbridge Swamp
Guam Tar.
Swamp lizards are an alternative to the Ranging skill. These lizards are powered through a specific type of 'herb tar' per type using herbs and swamp tar.
You use a clean Guam herb on some swamp tar and there you go, you just made Guam tar.
I only know of one:1.) Swamp Tar (Lumbridge Swamp or Mortmyre Swamp, preferrably Lumbridge Swamp). I think it sell at about 150-200gp each. I do not know the exact price. you can earn up to 300k + an hr. Probably 200k an hr on average.
Swamp Lizards eat Guam Tar ( Acts as ammunition ).To make Guam tar at level 19 Herblore, you use 15 lumps of swamp tar on a clean Guam herb while possessing a pestle and mortar to make 15 lumps of Guam tar.Note: You can obtain swamp tar on the ground around Lumbridge Swamp.
You need to get Swamp Tar and take it to the chemist in Rimmington where he can turn it into oil.
Player made item. Use a clean Guam herb on a pestle and mortar, then use the crushed Guam on swamp tar to make Guam tar.
You use a tinderbox with it You take some Swamp Tar to the Chemist in Rimmington. Click and use the Swamp Tar on the lamp oil still (the small one, not the big one outside his house) and dip the lantern in to collect the lamp oil you had just made. Then finish the job by lighting the oil with a tinderbox.
Harralander Tar
To make 400K on runescape per one hour,it will cost going to lumbridge swamp,behind "Bob's Axe's" shop. either teleport home then walk the rest , or walk from wherever you are standing. Start by picking up as many "Swamp Tar" as you can , and then collect as many as 2000 swamp tar. the prices range a vary from 200gp from price checking and if you do not agree with this you can "price check" you'reself as you wish.This will not affect on non-members as you have to pay to play. AUS $12 per month.. if you are already currently doing this and haven't made atleast 400K from 2000 of these.. you should note that the prices have gone down on the swamp tar or have been redeemed as not tradable or sellabe at the grand exchange. thanks and i hope you make millions!!! =]
The current Market Price for Guam Tar is: 20gp.