While shading works with MkIV, with LMTX the following breaks: \startMPpage comment("two shades with named colors"); fill fullcircle scaled 5cm withshademethod "circular" withshadecolors ((1,0,0),(0,0,1,0)) ; fill fullcircle scaled 5cm shifted (6cm,0) withshademethod "circular" withcolor (1,0,0,0) shadedinto "blue" ; \stopMPpage The log says: metafun > log > metafun > log > error: Unknown relation will be considered false metafun > log > metapost > log > metapost > log > <to be read again> metapost > log > : metapost > log > if(EXPR0)>temp_any_u: metapost > log > temp_any_u:=(EXPR0);fi ENDFOR metapost > log > max->begingroup.save.temp_any_u;if.pair(EXPR2):pair.temp_any_u.elseif.string(EXPR2): string.temp_any_u.fi ;temp_any_u=(EXPR2)for.i=(TEXT3):if.i>temp_any_u:temp_any_u:=i;fi.endfor metapost > log > .temp_any_u.endgroup metapost > log > mfun_max_radius->...er(EXPR2)-xpart.center(EXPR2))++(ypart.center(EXPR2)-ypart.lrcorner(EXPR2)),(xpart.urcorner(EXPR2)-xpart.center(EXPR2))++(ypart.urcorner(EXPR2)-ypart.center(EXPR2))) metapost > log > endgroup metapost > log > withshademethod->...cimal.center(EXPR0)withprescript"sh_center_b="&ddecimal.center(EXPR0)withprescript"sh_radius_a="&decimal0withprescript"sh_radius_b="&decimal.mfun_max_radius((EXPR0)) metapost > log > fi metapost > log > <to be read again> metapost > log > withprescript metapost > log > withshadecolors->...hprescript"sh_color_a_"&decimal.mfun_shade_step&"="&colordecimals(EXPR0)withprescript"sh_color_b_"&decimal.mfun_shade_step&"="&colordecimals(EXPR1)else:withprescript metapost > log > "sh_color=in... metapost > log > <*> comment("two shades with named colors"); fill fullcircle scaled 5cm withshademethod "circular" withshadecolors ((1,0,0),(0,0,1,0)) metafun > log > metafun > log > Oh dear. I can't decide if the expression above is positive, negative, or zero. So this comparison test won't be 'true'. metafun > log > metapost > log > ; fill fullcircle scaled 5cm shifted (6cm,0) withshademethod "... metapost > log > Hans told me not to use the B tag, so I'm asking first in case I've missed something. Thank you in advance. Best regards, Jairo