Unofficial Oblivion Patch

Purgeblood Crystal Formation container base FormIDs: xx001B86, xx002087 & xx00208A.

Purgeblood Salts FormID: xx001372.

Certain containers are set to contain -1 items of a particular object. The intention is to cause those objects to respawn when their containing cell resets even though other contents of the container might not. Due to a fault in the way the game handles such cases, however, an infinite number of the respawning item can be obtained by removing it from the container and putting it back again. After that, removing the item again adds a copy to the player's inventory without removing the copy in the container. This can be done as many times as required, but only with the item whose count is set to -1.

Quote taken from here: Oblivion:Exploitable Glitches (UESP).

Basically the same issue as the Iron Battle Axe in the locked cupboard in Glarthir's house. The -1 amount of the Purgeblood Salts in the Purgeblood Crystal Formation containers should be set to a positive 1 amount (or any other positive number), to prevent any duplication glitches from occuring when depositing more Purgeblood Salts into the Purgeblood Crystal Formation containers. More information in the bugs section here: urgeblood_Salts" target="_blank">Oblivionurgeblood Salts (UESP).

There is also a second report on that page about eating too many Purgeblood Salts in a short amouny of time causing game instability, but I'm not sure of that report's validity.