A few thoughts on Portfolio Series pastels, with photos and videos of pieces I've done using them.
Top Tips on Using Water-Mixable Oils
Crayola Oil Pastels Classpack, School Supplies, Water Soluble, 12 Colors May Vary, 300Count, 523630
Mark Making Tools For Mixed Media Painting — Learn to Paint Podcast
Water Soluble Oil Pastels - Mixed Media Club
Which Oil Pastel Brand is Best for Beginners?? - KAREN CAMPBELL, ARTIST
Wooden box with 72 oil pastels
Portfolio Series 24 Oil Pastels Water Soluble Wet Or Dry Works NOS 2002
DOODLEWASH REVIEW: Caran d'Ache Neocolor II - Doodlewash®
Colorful Dreamscape: Creating with Kuretake Gansai Tambi