Acid and Phosphorus are two key ingredients for your liquid product in Schedule 1. If you discovered this earlier than the main quest, you’ll probably get confused about where to get them. Here’s how to buy Acid and Phosphorus in Schedule 1.
How to Buy Acid and Phosphorus in Schedule 1

To get Acid and Phosphorus, you must talk to Oscar in the Warehouse past 6 PM. The Warehouse becomes available once you finish the “Wretched Hive of Scum and Villainy” quest.
Acid and Phosphorus cost $40 each, which can be very expensive if you are strapped for cash when making your plant products. Buy as many as you can from Oscar. Each ingredient can only stack up to 10 per inventory slot, so you must clean up your inventory if you want to buy in bulk.
The police usually hang around near the front door of the Warehouse, so you should run to the side to avoid them. If you get spotted, you should run to the motel’s side to escape from the police because there’s a dead end behind the warehouse.
Related: All Mixing Station Recipes in Schedule 1
What is Acid and Phosphorus Used For in Schedule 1?

Acid and Phosphorus are combined with Pseudo in the chemical station to make “liquid product” that sells for a bigger profit. Since they cost $40 each and the Pseudo is also expensive, depending on the quality, each process costs $120+.
However, you are getting 10 pieces to sell for each craft, so you should capitalize on mixing ingredients with them to make them more addictive and valuable.
Since this product takes a long time and you probably lack space in your properties when you reach this point, you should hire a chemist to create your liquid product for you.
Published: Mar 28, 2025 4:19 PM UTC