Trade etiquette / procedure for high volume currency

I had the good fortune to drop a raw mirror this morning. If I wanted to liquidate this for divines, how do I go about handling that? Divines only stack up to 10, so the most you can accept in a trade is 600 at a time. How do I not get ripped off by not getting the second half of divine stacks? And conversely, how does the other trade partner get the assurance that they are not getting ripped off if I don't attach it during the first bulk part of the trade?

Hoho that's a tough one best way is probably collateral mageblood+divines something like that, Trade back mageblood for the 2nd round of divines. Just don't let them slip in a shit 2 flask mageblood.

Another way is to ask for mirror shards. Get 4 mirror shards which is 152 div, so the trade window could have 508 div + the 4 mirror shards and then you trade the mirror shards back for div.

Or whatever the correct math is. I think I screwed it up but you get the point.

There are also other currency items like locks and fracturing orbs to trade with to make up divines and not have to worry about collateral.