I am sure that this has been posted here somewhere before but this is my take on it.
I do love me some slants. They store so nice and ship well.
Anyways this is how I go about doing mine....
900 mL of water
18 grams agar powder
9 grams of LME
Coffee stir sticks cut to size for 20 X 150 threaded test tubes
The recipe above is for 40 slants.
Cut the sticks to size just to fit inside of the bevel on a 20 X 150 test tube.
I usually do a bunch at once in this case on a chop saw.
Throw them in a glass of water and stick them in the microwave until the water boils. Pull them out and let them soak while you get the agar ready.
Add 900 mL of warm water to a sauce pan. Mix in the agar and LME. Make sure it is all dissolved and bring to a simmer. Simmer while stirring for around 10 minutes.
Line your tubes up in a rack.
This cheap guy works great.
Place a stick in each of the tubes and fill about 2/3 the way with agar. I use a 30 cc syringe to measure the agar out in each tube. I have marked it at half and use a full syringe to fill two tubes.
Use water at first to get your mark in the right place. Once done you are getting about 17 cc of agar per tube.
Once filled tightened the caps. This is the method that has worked best for me. I have yet to have one explode or boil over.
PC for 45 minutes and let them cool until you can touch the side of the pan. It should be hot but not pull your hand away hot.
Lay the whole rack on its side to achieve the angle you want. You may want to experiment a bit before hand with water to see what give you the right angle.
I use small white dishes like you would see in a sushi restaurant for soy sauce. Two of those stacked works well for me.
I let them cool in front of my hood. You could also do it in a sanitized SAB.
Here is the final product.