Hello.

When i would like to braze or solder items that will
be in contact with food/water,like utensils,i know that i should use a safe filler which is
cadmium free,lead free,zinc free etc.like the Sn96/Ag4 silver-bearing soft solder.
But what about the flux? is it matter which flux i will use? i mean,in the aspect of the
food contact with the soldered joint,like toxic flux residues that may left on the joint or become parts of the joint.
i don't mean in the aspect if the flux suitable to the temperature of the soldering
or to how good it prevented oxides during the soldering.
Since i didn't find any site that is mentioned any food safe flux,i wonder if this is not an issue,while cleaning the soldered joint after soldering
is enough and i there isn't any special food safe flux?

Thanks in advance.

If i am not wrong,fluxes do not contain metals such as lead.It is like to declare that olive oil is cholesterol free.I know that the fluxes,sometimes,contain metal halides as an activators,but not lead.

I didn't understand exactly what you mean,since,I,actually refered,among other,to brazing items like utensils etc.that you,actually licking food from them.
So,what are you saying?that there are toxic residues of the flux after soldering,that become part of the joint and you can't clean it?

I would like to clarify my question and focus on the main issue:
When we solder or braze a filler to a joint of an item,the metals that the filler are made of,becomes part of the item.So it is important,in the aspect of health concern,to choose a filler that contains metal alloys that will be suitable for our application,such as lead free filler for potable water).
But the flux does not become part of the item,does it?
The residues after the soldering can be cleaned entirely,can't they?
Is it possible that after the soldering/brazing,some ingredients(maybe toxic)of the flux will become chemically part of the item,which can't be removed?or all the flux residues and all its chemical byproducts on the item can be cleaned/washed?

If i use a flux for water pipes,i,definitely,will use safe flux and it is understandable why.There isn't any access to the inside of the pipe,in order to remove the flux,except
of flushing water and if the flux is not safe and it doesn't dissolves in water,i can't guarantee to remove all the non safe flux(as you said),since i need a safe flux that can be rinsed by water.
But if it is a utensil and i use a non safe flux,i can clean and rub it with hot water,dish soap and cloth,alcohol etc.In that case can't i remove,entirely,all of the flux byproducts and residues?or even in that situation,no matter how much i will clean and rub the utensil,some of the flux will chemically bond to the item and nothing can removed them?

you said:

But i am not sure if your intention was to the water pipes or to any items.

Do i?
I don't think so.
If you will read carefully all of my posts,include the title of that thread,you will notice
that i have repeated my question over and over again,but i didn't get an answer for my specific question.
I know that plumber flux for potable water(standard 61)is probably the safe solution.
But i didn't ask a recommendation for flux.
I just would like to know:if i use a flux(any type of flux)which may contains toxic ingrediens,can it be cleaned entirely after soldering or some of the residue may become chemically part of the item/can not be removed ?
That question is not refer to water pipes which don't have any access to clean them inside,it is refer to item like utensils that you can clean them directly.

Did you refer to any type of flux(flux that dissolved in water and flux that is not dissolved in water)or only to the plumber water-dissolved flux?

This was my main question:

Yes,but only after"wayout440"explained to me its comment about the comical reference to soldering electronics in pinball machines.
Besides that,i saw several threads with questions related to solder flux in that forum,so i though that there are experts here about this issue.
I think that my question was clear enough,so what are you suggested?
may someone has a knowledge to answer it or may i try other places,as wayout440 and RCA1 recommended?

Ok.thanks alot for all the responses.
I guess,i have to keep digging in order to find the answer.