The Alchemical Reaction Chamber or ARC is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script will add multiple recipes to the ARC, it should cover all the bases of what is possible

ZenScript
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// <recipetype:bloodmagic:arc>addRecipe(name as string, output as IItemStack, outputFluid as IFluidStack, input as IIngredient, inputFluid as IFluidStack, arcTool as IIngredient, consumeIngredient as boolean, addedItems as @Optional MCWeightedItemStack[])

<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_all", <item:minecraft:glass>, <fluid:minecraft:lava>, <item:minecraft:diamond>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), false, [<item:minecraft:apple> % 50]);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_extras", <item:minecraft:diamond>, <fluid:minecraft:lava>, <item:minecraft:dirt>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), false);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_fluid_output", <item:minecraft:diamond>, <fluid:minecraft:lava>, <item:minecraft:glass>, <fluid:minecraft:empty>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), false);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_fluid_input", <item:minecraft:diamond>, <fluid:minecraft:empty>, <item:minecraft:apple>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), false);

<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_all_consume", <item:minecraft:stick>, <fluid:minecraft:lava>, <item:minecraft:water_bucket>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), true, [<item:minecraft:apple> % 50]);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_extras_consume", <item:minecraft:arrow>, <fluid:minecraft:lava>,<item:minecraft:pufferfish_bucket>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), true);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_fluid_output_consume", <item:minecraft:shield>, <fluid:minecraft:lava>, <item:minecraft:lava_bucket>, <fluid:minecraft:empty>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), true);
<recipetype:bloodmagic:arc>.addRecipe("arc_recipe_test_no_fluid_input_consume", <item:minecraft:stone>, <fluid:minecraft:empty>, <item:minecraft:water_bucket>, <fluid:minecraft:water>, <item:bloodmagic:basiccuttingfluid>.anyDamage(), true);

The following script will remove all recipes from the ARC that output a Weak Blood Shard.

ZenScript
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// <recipetype:bloodmagic:arc>.removeRecipe(output as IItemStack);

<recipetype:bloodmagic:arc>.removeRecipe(<item:bloodmagic:weakbloodshard>);