Outside of the small ammounts of material, bleach is one of the worst oxidizers to be used in refining. It kills the acid, since it is basic, and it is that dilute, you need to add horrible ammounts, accounting for much more waste to treat, comparing to the other methods. And it add up ton of salt, since brine (from which it was firstly made electrolytically) is still left there. Aside of many stabilizers added to prolong the shelf life. Rising chloride content can cause issues with silver chloride afterwards. But this isn´t major drawback, of course
If you can get hands on 30% peroxide, then do it and use that instead for foils and gold powder.
No added salt, molar weight of H2O2 is only 36, and as it comes 30% concentrated, there is fair ratio of volume vs. oxidizing power. Excess is simply decomposed to chlorine and oxygen. And similarly to bleach, no need to kill excess oxidizer other way than adding SMB till gold is dropped. Maybe the cost is higher than other alternatives, but the ease of use, no hassle afterwards and clean operation are major benefits.
PS: At elevated temperature, ammount of dissolved chlorine in solution is miniscule, and decomposition of bleach in strongly acidic enviroment is very quick. Just take the watchglass from the top of the beaker for few minutes and it is done. Also, SMB will react with dissolved chlorine and reduce it back to chlorides as quickly as dropping gold. This will happen simultaneously, so no need to do it separately. Just use SMB like usual and you will be fine
