Very few teach the kasinas to lay people because they are incredibly difficult to cultivate compared to the breath or the divine abidings.
"Ramon1920"If you want to cultivate a kasina you will need to practice very strict and continuous sense restraint, possibly for months, on a single kasina.
You will also need to become very familiar with the 5 hindrances and their antidotes to troubleshoot your disposition and energy.
Making merit will improve your meditation drastically.
Making the image stable is something like learning to hold back a sneeze, there are impulses to jump off or to pay uneven attention to different details and after you've dealt with the hindrances to the best of your ability it's a matter of developing a skill.
Caffeine may help you, but as firmly as I believe caffeine to be a major food group I've heard it makes some people anxious.
You will want to get a copy of the Vishuddhi Magga. It has a section on the kasinas that has practical instructions on setting up disks, the progression of developing the individual kasinas, and which kasinas are suitable for which temperaments and the powers developed. There are a few short instruction manuals online that I've seen on colour kasinas but they did not have anything very useful.
yea it seems most talk about the (after effect) or the result more than the step by step process needed for it,
i'm fimiliar with the full moon or candle practice,I have heard about the disks(and seen them on some websites) but I have never even seen a disk in person.
mostly used candle in center of pitch black room
The kasinas are practiced in the Vajrayana, but like most things in Vajrayana they are integrated into the larger practice of particular deities.
I was beginning to think it only existed in some remote Thervadan schools
"Ramon1920" Some time ago I put a lot of effort into developing a colour kasina, I did not develop even the purified nimitta in a way I think was satisfactory. With colour kasinas people distinguish 2 nimittas, one being the stain on your eye when you close it after staring, and then another being the stainless purified colour disk nimitta you mentally create and have stabilized.
I was told the 2nd nimitta that was created was not a true Nimitta.
(EXAMPLE)1st is the stain on your eye, then you create a mental image "nimitta" from that stain,and maintain it(this replaces the "sight" sense stain of eye with a created mental image nimitta)
after that concentration is purified with the initial "created" mental image Nimitta.
the true natural arising mental image Nimitta arises without ever being created.
now you have your "created" mental image Nimitta and the "naturally arisen" mental image Nimitta
from there you switch to the natural uncreated image focus on the center with awareness...........................
(this is heard from explanantion not an actual experienced practice)
(also i have heard that its easier to use awareness of the breath cause the transference of awareness over to the natural arising Nimitta is easier to accomplish then from created nimitta to natural arising nimitta)
i hope I didn't confuse also this info might not even be correct hearsay can only go so far