Had one spool of transparent PLA from Vellemann. Now as that is printed I got the same in red - it seems to more brittal. Some parts are broken during taking from the Kepton which never happened with the transparent one.
Did you also saw differences between colored and nature.
What are your experiences with different manufacturers (resellers)?
@Karsten_Fuhst to my understanding, there are many things that can cause the PLA to be brittle. for instance if the PLA has be recycled several times the material is not going to have the same quality, or if the material was excessively heated the same problems could exist. So yes different vendors could have different qualities of PLA
One thing to note is that PLA that is colored will have a different melting point then natural PLA.Is the part brittle along parallel with the layer lines or in all directions. if your part is only brittle in cases where force is applied along the layer lines then your print settings could just need to be changed (IE not extruding at high enough temperature, or not extruding enough material)
If the recycling makes the difference transparent PLA would have the advantage that it is harder to recycle as colored. When transparent material will be recycled it will become some colored. For black PLA you could mix everything in, apply the color and you cannot see what it was. So transparent might be the best quality material.
Black typically has a higher melt point as well. I print clear at ~195 and black at ~205