Difference between types of Thai black soy sauces (Healthy Boy brand) I've noticed that a lot of Thai dishes call for thick black soy sauce, but they rarely specify the type. Occasionally, a recipe will specify a certain brand, and sometimes they'll note if you should use the "sweet" (pad see ew, pad kee mao, etc.) or "regular" (pad ka prao, etc.).

When looking, I'll usually stick with Healthy Boy, since that seems to be the standard (and the most widely available in the US). When I get to the local Asian market, though, I'm confronted with about 5 or 6 types of Healthy Boy soy sauce, each of which says "Black Soy Sauce."

Within those, I've been able to narrow it down to three major types so far: 


Black Soy Sauce - Thick, salty, sweet, strong flavor
Sweet Black Soy Sauce - Thick, somewhat salty, very sweet, strong flavor. Not always labeled "sweet"
Light/Thin Black Soy - Thinner consistency (similar to regular soy sauce). I have never tried this.


While it's easy to tell the light from the others (just flip over the bottle), telling the difference between the sweet and regular is not always as easy. Thankfully, Healthy Boy color-codes the bottles. So far, I have seen:


Light Orange (regular?)
Dark Orange ("stir fry seasoning with soy sauce?")
Brown/brown-orange
Green (says Black Soy Sauce B, I think. High sugar content, mostly additive)
Red (sometimes says "sweet")
White (sometimes says "sweet")
Yellow - thin/light
Yellow - thick


Each of those typically have varying sugar/salt contents, and have anywhere from 3 to 10 ingredients. Some are also labeled "Natural Ferment" (sub-questions: What does this mean? Does it matter?)

Just going by the bottle color, is there an easy way to tell the difference between all of these? Also, are certain colors more suited to certain dishes?

(I've also seen a couple Bronze and White that are mushroom and oytser flavored respectively, but this isn't about those ones.)
I'm Miranti, the owner of the recipe for Pad See Ew in question (http://highheelgourmet.com/2013/04/18/pad-see-ew/) ...Hello everyone. 

The sweet dark soy sauce isn't the "particular" preference for the dish. I used it because I don't want to use sugar. You can use dark soy sauce and add sugar too, as Puri mention in his comment. This dish shouldn't start off sweet. This dish or any Thai dish shouldn't start off sweet. Sweetness is just to "round up" the flavor but not the lead. We're not making dessert here.

When I cook stir fry noodles or stir fry anything that I need dark soy sauce to add color to the dish, I would pick sweet dark soy sauce instead of using dark soy sauce with sugar. The magic ingredient in the sweet dark soy sauce is the "molasses". The most sweet dark soy sauce would, in general, have higher molasses content than dark soy sauce. 

The taste and flavor of molasses can add more dimension to the sweetness, not just bland one dimension like sugar. It helps if you cook with the household wok that might have non-stick coating or didn't have deep seasoning flavor in the wok like the restaurant's woks that has been through cooking over hight heat several thousands times and packed those "wok well season smell" on the surface. When you cook the noodle in those woks, the noodles would pick up the yummy smell and that completed the dish for me. (The flavor of an experience street chef's dish...even the replica is better than none). In order to mimic that smell, I used sweet dark soy sauce with high molasses content and omitted the sugar just because I can't have the restaurant wok! I also doing the same thing with my "Drunken Noodles" (http://highheelgourmet.com/2013/07/27/drunken-noodles/) too.

Another note about the brand, I use healthy boy brand, dragon fly brand, golden label (least favorite due to high MSG content), and a few others ALTERNATELY. I'm suspicious that there might be some kind of additive that quite foreign to our bodies or at least my body and I don't want to give it a chance to let them collect in my system. So, I keep switching the brand as soon as I finish one bottle (sound paranoid but I rather be paranoid now than later). I can adjust the taste because I taste test everything but I can't adjust anything when there is lump or tumor appear in my body. 

My favorite brand is dragon fly but that also don't make me buy it more often than the other brands. 

Sorry I should have seen this earlier but I was busy and just saw the link.

Thanks for explanation about the healthy boy brand. I would keep the link in case I need to refer to the different type of the soy sauce!