Red bell peppers are a mature version of green bell peppers. They have a sweeter taste and a more vibrant color than green peppers. Red bell peppers are also higher in vitamin C and other nutrients than green peppers.

When you slice a bell pepper in half it will look exactly like any spicy chile pepper. There is a placenta covered with seeds, there are veins running along the flesh of the bell pepper. They are pretty much identical with the main exception being the difference in size. Bell peppers have a fruity scent, just like many hot chilies. Both have a crispness to their flesh and also high water content. You can slice, sauté, grill, char, pickle, stuff, or eat bell peppers just like you would any kind of spicy chilies. But when it comes to bell peppers you'll never have to wear gloves to protect your skin from a chili burn, and you'll never have to reach for a drink to calm the fiery heat after eating bell peppers. 

Now, let’s say you don’t have any of these ingredients, your last resort would be to use black and white pepper to replicate the peppery and smoky kick that paprika offer. Chili flakes will also do in some recipes that use paprika as a garnish such as deviled eggs and potato salad.

So, how can you substitute chili powder for paprika? Well, I can't really give you a standard substitution ratio. It's best to add it gradually, give your recipe a taste, and then adjust accordingly.

Overall, paprika oleoresin is a versatile ingredient that offers the characteristic color and flavor of paprika in a concentrated form, making it a valuable component in various food and non-food applications.

If you've found yourself out of Sriracha and need to find an alternative ingredient, here is a list of Sriracha substitutes you can use in its place.

In some cases, the paprika is being used primarily to add color to a dish, in which case you could add a small amount of some other red ingredient, which could be anything from a teaspoon of ketchup with a dash of chili powder mix to tomato sauce, finely pureed red peppers, tomato paste, or red beet powder. If you have bell pepper powder, use a 2:1 ratio, as the bell peppers are very sweet and don't have the kick of sweet paprika.