At Land of Lost Luggage, Julie Prichard tested a variety of pens on several acrylic substrates here.
Gentian at Drawing with a Squirrel did a colourful sample test of the Staedtler Triplus Fineliner Pens here.
I have these and really like playing with them when writing notes with different colours. I haven't used them for any art project...yet!
Jana Bouc's journal compared three sepia pens and several sepia inks recently here.
I love the colour sepia and eagerly awaited the results of Jana's tests. I own all of the pens tested but only in black. I don't have these inks, but do have the Sennelier sepia--a lovely rich colour.
Alberto at Lung Sketching Scrolls has been very helpful with his recent reviews and photo examples of white coloured pencils, Caran d'ache Supra color watercolour pencils and the Uni-Ball #3 watercolour set.
Like Alberto after I got the Uni-Ball #2 watercolour set from Jet Pens, I ordered the #3 set. It's nice to know that these are the equivalent of the Faber Castell Albrecht Durer pencils, and that the Caran d'ache pencils are a good substitute for the Durers.
I will try to do a compare and contrast of my own white pencils, and do some doodling with the Uni-ball #3 watercolour set...later this week.