more than 10 ppb the metals which play havoc in the production of high precision electronic components include alkali alkaline earth metals and transition metals and ions thereof specific examples of commonly encountered unwanted metals and the corresponding ions include aluminum calcium chromium cobalt copper iron magnesium potassium and sodium the amount of stabilizer to be used to stabilize the hydroxylamine or the at least partially neutralized hydroxylamine salt solution ranges from about 0 001 to about 0 1 percent by weight of composition preferably the amount of stabilizer ranges from about 0 01 to about 0 5 100 500 ppm same basis the aqueous solutions of free hydroxylamine i e fully neutralized salt can be produced by the reaction of a salt of hydroxylamine such as the hydrochloride the nitrate the acetate the sulfate etc with an alkali metal hydroxide such as sodium hydroxide or with ammonia the concentration of the hydroxylamine salt is usually at least about i weight percent of the aqueous solution and can range up to about 70 or more but is generally in the range form about 10 to 70 weight percent it is best to add the stabilizer to the hydroxylamine salt solution before its neutralization with a base but the stabilizer can also be added to the at least partially neutralized hydroxylamine salt solution and salt free hydroxylamine solutions the temperature during the.