A leak on flour...

Flour that got wet

Saliva can cause wheat to become chametz. Dont chew wheat and put on a wound. Be careful when feeding animals if they wet the wheat.

Rubbed a wet duck with bran, its asur because the bran gets into the pores.

No flash boiling bran. Dont use bran during washing.

Roasting wheat together, making vitka from wheat and water vs wheat and oil.. dont mix flour from roasted wheat in water, perhaps it was not fully roasted.

Clean out the salt from wheat do it doesn't become chametz

Wheat in honey or vinegar will not become hametz and forbid the vinegar unless there is water.

When making dough for passover with fruit juice alone, one should make less than the amount that requires taking challah so that there is no problem disposing of the challah since without water it will be challah tehorah

Using egg whites in matzah. Sephardic and ashkenazi customs regarding matzah ashira