I found 2 very interesting articles on medical and veterinarian journals.

The funniest, if I may say, is the one titled Non-Surgical Castration in Bucks, not withstanding the facts that the article is coming from Arabia (land still found in eunuchs at least for 1001 nights) the "in bucks" can be taken at multilevel meanings : slang for "doll...arts" sorry dollars, the Webster dictionnay makes it a familiar term for A DANDY (a man but effeminate...) the intended meaning is of course male genitalia of big animals such as deers - Ho dear etc..

We know that we are just animals among many others mammals according to the darwinian mythology (I myself tend to be creationnist, well not in the reactionnary religious terminology, let's say I am an other type of constructivist...)

Anyway Here is the link to Non-surgical Castration in Bucks,

www.iasj.net/iasj?func=fulltext&aId=31993‎

AL-Qadisiya Journal of Vet.Med.Sci. Vol./11. No./1. 2012 ... Keywords: - Non-surgical castration, Chemical, External ligation, Spermatic cord, bucks. Introduction.

[PDF]

The other article, just the abstract comme for a less exotic place : on Percutaneous Orchiectomy (technical term for balls injection - I love it)

http://meetinglibrary.asco.org/content/33625-65

I also browsed all possible posts on eunuch.org and other sites about people having done or doing it. Interessting.

Seems there are less risks or accidents. Just read a post on banding one more threatening things to be found and make you hesitate about any acting out.

Thanks for any post about pecutaneous orchiectomy (term a prefer to "ball injonction) as it may or may not be the methode I'll use.

These are PDF links, I do believe, so read them before they are gone.

As for formalin, as I understand it, formaldehyde:

Formaldehyde, in its basic form, is a gas. Most people think of formaldehyde as a liquid. The liquid is actually a mixture of formaldehyde gas and water. The most common concentration used is a 37% solution. That solution contains 37 grams of formaldehyde gas to 100 ml of solution. Formaldehyde solution will polymerize. To prevent polymerization of formaldehyde solution, about 10 - 15% of methyl alcohol is added. It is the addition of methyl alcohol that causes the substance to be called formalin as opposed to formaldehyde. We have occasionally encountered some confusion about the difference between formaldehyde and formalin. This is an understandable problem, since the terms are sometimes used interchangeably. It is incorrect to use the two words this way. The concentrations of chemical fixative that the two names represent are quite different. A fixative labeled as 10% buffered formalin is actually only a 4% solution of formaldehyde. This is because 10% buffered formalin is an example of old-time histologist's jargon describing a 10% solution made from a stock bottle of 37-40% formaldehyde (or more precisely: a 3.7-4% solution of formaldehyde).

Not something I'd want to inject into a human, though. We do have a long running thread on ethyl alcohol (grain, drinking alcohols) and salt injections, as the 2nd link discusses as well.

Formaldehyde is used to embalm dead bodies.

Don't use it on the living.

It's poisonous and will do more harm than you want it to do.

Thank you for answering so promptly. I was not going to use it for myself or others. What I am interested in is the idea of percutaneous orchiectomy compared to surgery.

I'd add that formaldehyde causes cancer.