Why does the cream turn completely brown-pink when preparing a formulation containing 5% hydroquinone, 0.05% tretinoin, 1 g erythromycin, and Beeler base up to 50 g?

What is the formula for Biafine-loco, a product frequently requested for treating burns caused by giant hogweed and other sources at the military hospital, so that it can be prepared in-house?

How can the problem of inhomogeneous distribution and unequal dosing be solved when preparing 5 mg omeprazole capsules using Merck pellets (containing 10 mg omeprazole) that must be diluted with lactose to achieve sufficient volume, given that the gastro-resistant granules are very difficult to distribute evenly throughout the powder?

What is the cause of the precipitation that occurs when combining a solution of 1 g alum and 1 g boric acid in warm water with a solution of 1 g resorcinol and 1 g erythromycin in 60 ml isopropyl alcohol, in a preparation with water added to 100 g?

How can erythromycin in a 3% cream be finely prepared using the Unguator?

How can the solubility of a 4% calcium gluconate solution for internal use be improved, given that a company requested it for fluoride intoxication and the preparation developed a precipitate after some time?

During the 2002 IPSA galenics lessons, a very simple device was used to determine the particle size in a cream or ointment, which involved spreading a small amount of the preparation on a board and then using a second board to swipe it over a groove; what is the name of this device and from which company can it be purchased?